Malicious PDF — malware analysis report

Static analysis result for SHA-256 9109be300d17fa1a…

MALICIOUS

PDF

93.3 KB Created: 2021-03-23 04:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a760c65930e926df8f8d046b8c0827c5 SHA-1: 8bd35182741580eee4fa0651be1ce77c157c588f SHA-256: 9109be300d17fa1a3f30527c483d91b4befddd7a681d9bccba481a8ce336ee4f
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution scheme, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=quantitative+aptitude+formulas+pdf PDF link annotation
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/gfEghjj/skillz_logic_brain_games_online.pdfIn PDF document text
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/danopovokimubamex.pdfIn PDF document text
    • http://xodoruzix.iblogger.org/17404870423.pdfIn PDF document text
    • https://cdn.sqhk.co/tizadufof/hadjdN3/77544797451.pdfIn PDF document text
    • https://legukofa.weebly.com/uploads/1/3/5/3/135318177/33e6fb7704.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/miiKicI/89830072302.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/cig9I4j/share_web_page_on_twitter.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
    • http://rajuleneto.epizy.com/sofunav.pdfIn PDF document text
    • http://risubutiz.rf.gd/rozodobiwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edaf1e5e-5360-445c-bc8b-1b18d776aad8/swann_security_camera_cable_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4baa19d9-f4bf-4f78-a79f-ab53a9d90096/what_is_subnet_mask_example.pdfIn PDF document text
    • http://famirafopuremu.rf.gd/basics_of_structured_cabling.pdfIn PDF document text
    • http://fawofalolujug.epizy.com/actiontec_c2000a_firmware.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_70e4cb30c6884abb9e1555ebd0c76865.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_02bd1b95ea944287ac557d4e427bfbf7.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_cf9a09a02a7a4a5d8e5361a98d3ab60b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fd956d-2609-424b-b0b9-62fd002433ab/is_home_alone_2_on_netflix_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a834a30-8fff-483e-afa8-abe13276695e/irobot_roomba_black_friday_2020_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48109182-8bd4-4b62-b116-d55581ad95ed/how_to_remember_the_atomic_mass_of_first_20_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ff60dc-0ff1-437d-9b2d-b3a39715ee46/51366187031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92293d9f-c731-42cb-8151-66d0e03c1359/what_are_the_expense_accounts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340e4241-7ec4-4000-a220-1c7a9586b7d0/what_are_the_levels_of_measurement_with_examples.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_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 5192 bytes
SHA-256: 2971384ff1f1dd4e3152f9a7c0101704a15dadbbfab891979de2089ede1631ab
font_01_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 13116 bytes
SHA-256: 4b85e664217d609004a7b2b1ef2c39e456692ba8ed8cec21c567b37fefd9cee8
font_02_sfnt_off00014279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14279 16368 bytes
SHA-256: 62e01985c3bf86197dd26817c88ff4e5e458ad8260fc035f8a1140f855f48b04
font_03_sfnt_off0001588e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361