Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b666bf1d7a0eac…

MALICIOUS

PDF

85.1 KB Created: 2021-04-22 12:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d7cc77bc2b3b6378215bbb4b61831527 SHA-1: ad230162926a4fdae084d74e677cfb8d16001beb SHA-256: 01b666bf1d7a0eacf7755b9cf360b503197939c6478172300bc95f31dd118d2e
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 0.9998

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://nipisod.ru/strik?utm_term=wd+my+cloud+home+4tb+portable+hard+drive PDF link annotation
    • https://worejatejele.weebly.com/uploads/1/3/4/0/134095890/lobofawi.pdfIn PDF document text
    • http://studyweb.site/agatha_christie_poirot_clocks_castgshjm.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/ec46dcb8a34.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/KTgjmiL/julukiwakurar.pdfIn PDF document text
    • http://1ux.site/62206075939quzpt.pdfIn PDF document text
    • http://taher-tcac.com/wekanoleruvsxwn.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/fgdhh30/modern_commando_secret_mission_fps_shooting_games.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/iemiNiF/snowball._io_unblocked_at_school.pdfIn PDF document text
    • https://ruzovaberup.weebly.com/uploads/1/3/4/6/134651658/9db6f37.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/jihf1RO/jenisom.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/jjiei7o/age_of_empires_2_civilizations_map.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/hpigNjf/wifib.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/XBgdHYi/3326404960.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/debamijizozexo/boss_picture_full_movie.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_519f4f0ab76847daa417cf4fc61ff71f.pdf?index=trueIn PDF document text
    • https://99d0733d-4d0e-4d19-b238-fea6f81017ca.filesusr.com/ugd/e32e4a_6989300de1034fa88925cb461ffc7e71.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_0b9624570c664cb48cd285c0be56dcc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/bivixobokenewalubepaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 11848 bytes
SHA-256: 294f62faa9d095d0942cf32252d83b2541dffc0acbd1eaad444c526cf2fcabbc
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 5540 bytes
SHA-256: c0e15ca11404373739b6fd799542e7763fc2319a229a1d2136fac73e3f44750f
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 11100 bytes
SHA-256: 8b0e9900c9c035613401efb5b66ed2c4550246d2a1582a644f8b46bb5b6fcc66

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