Malicious PDF — malware analysis report

Static analysis result for SHA-256 41275220c2cd5b54…

MALICIOUS

PDF

89.3 KB Created: 2021-04-06 09:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5838143ce0b0a66a7ed26db904b4b26c SHA-1: e581aac5b5a63da2b76466b21397437569297989 SHA-256: 41275220c2cd5b54153f58d0b8ce2d5226f1132cc9e5a8ca9d9f2a43ad8193d9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm for SEO manipulation or to distribute further malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=a+little+life+book+amazon In PDF document text
    • https://cdn.sqhk.co/dobusalebed/mjdiatb/votudiwejazilujuk.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/v6Rgf3c/great_little_war_game_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_5fd0e4d8da8ef.pdfIn PDF document text
    • https://bojifigo.weebly.com/uploads/1/3/4/8/134847606/3582080.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/jiwkJfA/logo_quiz_expert_level_12_answers.pdfIn PDF document text
    • https://riladubo.weebly.com/uploads/1/3/4/6/134684868/1629915.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/kuvivotimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61e32b89aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_600be4ac5f582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366956/normal_6007c85196eaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1r0zWx2/siriwugirafebasul.pdfIn PDF document text
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/8714344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5fc67b6671a78.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/8924404.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/nuzupawosi-bibefojovevobe-pakep.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/jugejusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c03e84c-c1ee-4c8a-9aeb-dd80d3ab75d2/the_last_of_us_1_trailer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25f7290-024c-4e2a-8acf-76b6042cb975/79655976064.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_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 4880 bytes
SHA-256: 4fd0bacced72c2a428452dcff6a896c5b1c7188fbe90f7d7b415932ddf62c43a
font_01_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 12132 bytes
SHA-256: 073129ea973a8588d5e9e6acdc2fc798db1b625d15ae1984ae57e5567186362a

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