Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c8a3936d18e6df…

MALICIOUS

PDF

88.8 KB Created: 2021-03-30 04:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a90357fbb2f17ac75814dd3e49d7b4bb SHA-1: e8102599ee40247204540a39bbe752f3a6079ca8 SHA-256: a1c8a3936d18e6dfc598fb9ac9eb724aca2501586fa2edbb8cc16da0c64bd2b8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=cengage+mindtap+excel+answers PDF link annotation
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/tulesuribusebiv.pdfIn PDF document text
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/rutidilal.pdfIn PDF document text
    • http://agent-spv.space/venexetasidlj6r.pdfIn PDF document text
    • http://car-den.ru/5737427169501mnz.pdfIn PDF document text
    • http://plusstore.pro/shintoismo_dioses8sz35.pdfIn PDF document text
    • https://felanixumuxovex.weebly.com/uploads/1/3/4/7/134705369/169095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_8e39214b81674c54bc099effddf7d520.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e69ac1-9d30-4b73-a433-59411872b8bc/tagurap.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_eedae38febc34a6bb4c8abae973fbf6e.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_0412f15c00dd4f68a615a603b07ecc2c.pdf?index=trueIn PDF document text
    • http://sosewovitifofus.epizy.com/92166330578.pdfIn PDF document text
    • https://da88601c-d7b1-4d42-bebc-9891560a8d86.filesusr.com/ugd/69695d_7e519cbcf2f544b8897d07012010c83d.pdf?index=trueIn PDF document text
    • http://mufejerawuvolej.epizy.com/stock_market_wizards_by_jack_d._schwager_1.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_48df6b58d3e44d45898d7124e8a41765.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_0dbf5c6f8a9440bf8562854e045abe51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/687de022-b2c2-4586-929d-f596e4a31a11/geometry_circle_proofs_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60248431-f8fa-4f82-86e2-fee57e0aef98/que_es_taller_pedagogico.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_591a563732454a9d90f13b6de07ffae4.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_af538fa2e8c14a56b2b0aeb5654047e7.pdf?index=trueIn PDF document text
    • http://kemolazovejuru.epizy.com/pokor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2067c48-c4fa-45c5-8f0d-52e0213b90b7/introduction_to_flight_john_anderson_7th_edition.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_a5c521e2b1234ef1bc2bde7184adf372.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3bd54f-c083-4071-b9cf-83dfb24075a7/sintomas_de_trombosis_en_la_pierna.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_6436e6010c18424bba0cf2cdc3b6c75f.pdf?index=trueIn PDF document text
    • http://robegataparusur.epizy.com/15241966255.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 5256 bytes
SHA-256: 837d4829e266080ec4d0a94f9b067e8ba228104a893faf66762cf36fea70d1c1
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 10860 bytes
SHA-256: 5a1122974229deeaf40aa0e00aed0c2f1b7bad0d0415d3c6189e63bb6f653960
font_02_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00014703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14703 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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