Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a8f7ed6ba86044…

MALICIOUS

PDF

68.4 KB Created: 2021-06-10 10:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3b433c7f73d85b44950c0327adf9d147 SHA-1: 0ee38dbb0caeff3ef22c211eafddf18f8ae5467a SHA-256: 61a8f7ed6ba8604491e99aa91e50f7d07139030f1c43eb075f15dd17955509f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'catamma.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a manual, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/pbw?utm_term=montgomery+ward+rototiller+gil+1580+g+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367311/normal_6013be440e871.pdfIn PDF document text
    • https://xilazugalalurid.weebly.com/uploads/1/3/4/6/134685369/6243939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_600ce4112a2bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_605f532db3523.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444630/normal_60aff148166b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_6063f65a1c351.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4497095/normal_60b069ec119d7.pdfIn PDF document text
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/jolezo.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/riwulipolawunanumixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajaduxaxusi.pbworks.com/f/kenexa_computer_literacy_test_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383b42c7-d3b2-4f65-8f8f-f1b7354e6eb3/what_is_meant_by_enthalpy_change_quizlet.pdfIn PDF document text
    • http://kesowununak.pbworks.com/w/file/fetch/144720141/how_to_get_napster_premium_for_free_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d5a04f-23bd-4691-8cd6-40a4ced0cfde/32731422736.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144908352/pubg_pc_discord.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144800997/how_do_i_claim_cerb_on_my_ei_report.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/cell_structure_prokaryotes_and_eukaryotes_worksheet_answers.pdfIn PDF document text
    • http://jixerumuji.pbworks.com/w/file/fetch/145020435/dowirapejotisemimeraduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1398ba99-8e48-4e67-9a7e-a022e5875495/6416454127.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 5680 bytes
SHA-256: a42b8ec66e01b42064ad6209a49fbf92f3a9bb3cc6a02976d950234621062bff
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 11464 bytes
SHA-256: 1d3c851d6fb09ab4f6690f769dc93e68e6e33b453bacdf8dd0f36a1571b3bf93

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