Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d33f86829087f0f…

MALICIOUS

PDF

70.8 KB Created: 2021-10-05 07:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4da16e74069874b2dc4fcf61c8a2f231 SHA-1: 2b888b59c19d206083525d221289c69b2af5b770 SHA-256: 9d33f86829087f0f2e3dbf9e45b7b04ea6b7aa8f5eeae28089b61456a061f684
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to lure users to malicious sites, likely as a first stage in a broader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://allytemp.ru/uplcv?utm_term=heat+of+combustion+per+ch2+group PDF link annotation
    • https://rm-parketi.si/uploads/sebubuzawaxakivinu.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/bitigogo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///77471994466.pdfIn PDF document text
    • http://geoman.cz/data/file/bularupudelil.pdfIn PDF document text
    • http://livilgirls.com/files/goluvusivosakuluxivafafo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395f63c53da---60055155986.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/zawaf.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotajod.pdfIn PDF document text
    • http://ccsl.asia/files/76484298134.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/piderureku.pdfIn PDF document text
    • https://uangraja.com/contents/files/17452296950.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/15242229331.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/rajubawonapadujamodo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89474886796.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132776e6a714---vosesadod.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/58684892604.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/pusalez.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/terupogojox.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/jetenobu.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/pavugavawogawipotow.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sifamifefegew.pdfIn PDF document text
    • https://777mto.info/contents/files/jimovobalikoputom.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/pumidinuwudovo.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/41836202480.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 11232 bytes
SHA-256: 67b1f830139ff2b2814b8e3b99017a4a0008027536a37740c8bf186677f27b74
font_02_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 14868 bytes
SHA-256: f08e21715634133e2896a756a91b25622d9423977aa14d8c0ecddde305818878

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