Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f978296367b88fe…

MALICIOUS

PDF

77.3 KB Created: 2021-02-19 04:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a4470d2d89931eb5ced079beb29dfc9 SHA-1: 503f575656c2229f82e9a66b3e76001d9f3ef964 SHA-256: 9f978296367b88fe0640f56e07c346d7e511bf426316477d0b694f14ac5eb468
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://druttle.ru/123?utm_term=principles+of+design+balance+pictures PDF link annotation
    • http://lupokixez.22web.org/expression_web_4_templates_free.pdfIn PDF document text
    • http://hamsterbig.com/you_will_be_found_sheet_musicu8mj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_60255ef7156d9.pdfIn PDF document text
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/dapok.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/d9mtiOl/evolutionary_perspective_psychology_questions.pdfIn PDF document text
    • https://potepivogatofef.weebly.com/uploads/1/3/2/7/132740463/ruwajejuzejizada.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ifgcTig/xosurebedu.pdfIn PDF document text
    • http://idealica-italiaoficial.site/75892460854a6eq0.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/40475e56.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/qihghDn/66504886329.pdfIn PDF document text
    • https://worikasef.weebly.com/uploads/1/3/5/9/135966717/kagafu_faxelirini.pdfIn PDF document text
    • http://islandlandscapesbb.com/44706915902g6kzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5ff8eea4ec74a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fecd16dc0648.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/285b3214e8139df.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/noun_verb_adjective_list_bac.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/Whjhcic/98483719600.pdfIn PDF document text
    • http://armlur.space/attestation_sur_l_honneur_de_non_ressourcesdocd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_60151c584b4a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 5464 bytes
SHA-256: 45a1a29c65dbc47db1412117162fe07be889661d0e1a02e8bd50492cd9bfb365
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 11124 bytes
SHA-256: 837e383d01ab26ca6ba2dabfb252ff558010be447052ebec8dec5f0a2436ab06

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