Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2deb0eb6b8b973…

MALICIOUS

PDF

109.1 KB Created: 2021-03-19 18:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 674295f4abe55097bc9f45b0d4fa862b SHA-1: 846a190817c930b8a54dd8a530b76e2570a762db SHA-256: dc2deb0eb6b8b973de7368d78e48402674373ef5f1e7bb29fee968bae184eb16
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8687

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=paradiso+perduto+libro+pdf PDF link annotation
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/lefitiliretaden.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/42330d2d764d.pdfIn PDF document text
    • https://nozonefabizeg.weebly.com/uploads/1/3/0/9/130969368/rubelevobigubax-tuvodiwijivetit-vulefezop.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/Rr1hagd/80761190530.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/domupuwev.pdfIn PDF document text
    • https://xebagamalod.weebly.com/uploads/1/3/1/3/131383607/600dc636a7975.pdfIn PDF document text
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/vezumoxofurev.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/urobilinogen_adalah.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/bokemak_rajedun_gugoninuvub.pdfIn PDF document text
    • https://zivukiwele.weebly.com/uploads/1/3/4/7/134749768/7d28abb4d6042.pdfIn PDF document text
    • https://cdn.sqhk.co/zewawugawa/bhekgdL/voxidisipo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/hijp6ib/xazunidavuzenexudor.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/pupifo-pomepa-wibazamif.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/nmV84hb/luwor.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/8Bja4if/69962004302.pdfIn PDF document text
    • https://motovatexasej.weebly.com/uploads/1/3/4/9/134900011/0bdc5a55b.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/3cNGEia/gowarinimaxedinoti.pdfIn PDF document text
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/62f44c.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/42334220130.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/46936016554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_1c53e9518b5a48e1a68f3ec96db1b040.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_5b373b5b60424fb5baa57bd82b40e2d2.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_34eda61dc9cc46e2b3ecb4d61f95772d.pdf?index=trueIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_916d3b807c4f4acdbcb37986abab4599.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17811 5176 bytes
SHA-256: 9afcd201b80e6b55506a3c94f81d9626bd448e5d824b3a562529e131d7fd4a24
font_01_sfnt_off000189ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189AE 12684 bytes
SHA-256: f29a6bc3aadcda3406a26a9bb647ec7ea948175eaf400838a0da8318159e3e24

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