Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3afdd01ea715105…

MALICIOUS

PDF

89.7 KB Created: 2021-03-29 02:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e7ff3d2042dfe71619dda89d540236f7 SHA-1: 053c8d71c726352a899fb5543510bf652616194a SHA-256: d3afdd01ea715105e78ff46162387efe08915d9e09786ce182dbbdfbcc8db073
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links pointing to other PDFs hosted on various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs suggest it is part of a campaign to manipulate search engine results or distribute malicious content, potentially via embedded JavaScript or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/award?keyword=lp+cephalgia+pdf PDF link annotation
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/9352233.pdfIn PDF document text
    • http://big-ita.space/761217079868tr5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5ff561e82b019.pdfIn PDF document text
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/4133179.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/3658974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_6039b2edf072e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fe62e57e005b.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/OoxjfYm/xabiwomoperegusava.pdfIn PDF document text
    • https://vibofigejud.weebly.com/uploads/1/3/0/7/130740502/daxasakegovi.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/3066588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_6040100cd3a87.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/verarapa-xerifixaxusofa-mirodu.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/EhdL0jb/nejepizofuvozu.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/2957063.pdfIn PDF document text
    • http://100p-f.ru/along_for_the_ride_lyrics_tyler_cassidyatf30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_60533ef028553.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/vubojuwukezufod_xevudiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5feb08a0e487a.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/ehg0chh/share_master_apps_transfer_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662c978138.pdfIn PDF document text
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/gajowogog_gajirijofizo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 1528 bytes
SHA-256: 2d84ae0636942eb5063defe9e2f34a76032a15a437a22af272f09e81a5429577
font_01_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 4576 bytes
SHA-256: 727dbc696d1230d3b3695d640ee4232fb005882a0a4686e0225fcb2f2d4a1484
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 11376 bytes
SHA-256: 04d031de7ccb40bb7f36f98a26447387a0c5333fbdbc267a3fe316a48a5ff139
font_03_sfnt_off00014b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B22 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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