Malicious PDF — malware analysis report

Static analysis result for SHA-256 6667ea3feb2ebe97…

MALICIOUS

PDF

130.5 KB Created: 2021-03-15 01:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 22f253059dd5fbf83564140bc2a72b64 SHA-1: fc8f09f3cb5ff54f39442f949229cf6b4e32ef5f SHA-256: 6667ea3feb2ebe973fed852d62b024bf22869ffa868d8791f91397b72bd9ebed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO poisoning tactic. The primary external URL, https://botokaw.ru/wix?keyword=tera+gear+guide+2018, is likely part of a phishing or malware distribution campaign. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF structure with numerous external links aligns with malicious PDF tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://botokaw.ru/wix?keyword=tera+gear+guide+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5ffa397ed1ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_603820e1b3c4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ff4a6e1a369a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391899/normal_5ff714292d0e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/bumobuzolububolamolefunu.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/classifying_and_balancing_chemical_reactions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9665dd0e-8fea-40cf-b6cf-0cfd1292061d/17590971845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfdb53b-9c7f-44af-bb3b-b593f5d4d8eb/similar_books_like_me_before_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d59bc8-89f0-4b8e-92aa-98abd9f88b62/wu_tang_american_saga_episode_5_watch_online.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_ec64cf91134a4aee94c0abaa1d42b5b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/resenha_critica_memrias_pstumas_de_brs_cubas_filme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff30bfc-a814-4385-9476-3eea469280d6/seduxorileduterawejekikut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b6ed35-e472-4540-8b51-1d9da0abee04/86228614705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f5000f-7d32-4f75-89a4-9777f35e18dc/52513157315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60933024-00b4-493b-bcea-4885c52858c1/85704494013.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_26b0de761fe04ece8e84c1fc3cc05103.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e35a30f-6469-4197-b975-8e5760f84a22/64826244154.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/58775320766.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/wezuvubanetobasurem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c341a318-a0f9-4f1e-8915-8a996eefcd38/rizokuzovexarozal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed55ddab-101d-40e7-a8ea-371e39d48a85/how_to_install_drum_kits_fl_studio_20.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C170 5252 bytes
SHA-256: 504c61c3cf81e0adcc9c3ee4f4d58d93570c8b69b5fef475014d0005b1c04b9e
font_01_sfnt_off0001d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D359 12248 bytes
SHA-256: d1c7268c993c322fb9fb9a31ee65de73fc484cb1ad7707d633f510c2a595495c

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