Malicious PDF — malware analysis report

Static analysis result for SHA-256 7800d726a0c008d5…

MALICIOUS

PDF

75.1 KB Created: 2021-05-09 08:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f369971a5c77f97acae16b3eb55838af SHA-1: de4186918fcc27fbcb550383015e60cec4285991 SHA-256: 7800d726a0c008d51cab37c1a3203da0965ff7a5657298df7aeb40de3ab67b93
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/strik?utm_term=who+makes+troy+bilt+tillers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405904/normal_60426d7ab5c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_603d7c18a831b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_6022f9ccadac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_602244c43a5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fd711b0bd391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ffbcfbb4d81e.pdfIn PDF document text
    • http://khareedforosh.com/persepolis_book_1_quotes2esb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452621/normal_60005b598187f.pdfIn PDF document text
    • http://tesocoin.online/805911678276yewg.pdfIn PDF document text
    • http://samozanyat.info/a_series_of_unfortunate_events_season_1_ending_explained32m7q.pdfIn PDF document text
    • http://rastet-malysh.ru/15073537286poc1.pdfIn PDF document text
    • http://mon-cmbretagne.com/baruguviwenawufnj6s.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/tafogusegabomu/why_is_the_red_standby_light_flashing_on_my_samsung_tv.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_017bc889250c48a38e64bd7408e1ed8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/28377980409.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_a7e40021ef254c90b7f7181f277d94f5.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_03870093bd0d4672bc9951b2d0b29fd5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/96760147451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b06437-36af-4f95-bb74-a33e0b94bd56/60249564899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5e7767-9da8-4b98-ad0c-0c3b3bf3b5f6/83367262154.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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5244 bytes
SHA-256: bb1000af4adae96e47f538179102f0741fa5dc9b8dd18d30d0474ee5ce9d3f82
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 11560 bytes
SHA-256: ace0660c2c356bf3bd7ed14d668d22c2a6ce39eaca893b8189a40a6e57c9cf23

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