Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd6f34c8b44ab4…

MALICIOUS

PDF

84.6 KB Created: 2021-04-05 12:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11d6087090dfd26ccf11b40a27f80923 SHA-1: 70ba183b740020614765177e4f877c9ffcdec269 SHA-256: b8bd6f34c8b44ab4138d1fa5ab305800fe3825fe8415196f39e3d9bfe01dfbe5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://baarspo.ru/strik?utm_term=xbox+360+user+manual+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472768/normal_603076b1a5e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_603fbaa9d148d.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/igjhjhb/nijoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5fff68d322cb7.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/HecZgjV/39508279643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_6069ecf3cd7cf.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuruba/g9v0JZa/sipanopis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5ff85a8f2863d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6067a8c941c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fcf3d5952d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_600fc2b3e02d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/eYk596R/cool_gaming_wallpapers_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_5fe8095e55bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc69194eeb6b.pdfIn 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
    • https://s3.amazonaws.com/xupizewuxere/17207965102.pdfIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_ec64e64a9eed427f9fce8a6f1f60a044.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/26445225194.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/carnival_of_the_animals_coloring_sheets.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_52b56bd1dd604168aeb35b4c158cf95c.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_77a14fccdaf84dd495abd12a1212d177.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_0537cdc33a9a4796913f2bf95634bed4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorogamat/acrylic_sheet_common_uses.pdfIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_007ea976dc5149d8bb47832d9a969798.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/imr_4350_vs_h4350_for_6.5_creedmoor.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_6744b75de94b4b79a938eb3ecb783414.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_0c5a0ba91c3d4087a6c918f68cd106d1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 5676 bytes
SHA-256: 96001b0a26ac46fff095a25b1a47b2fc133feb505073ad774aabad3c92fc8e05
font_01_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 10704 bytes
SHA-256: af76fb19371758f2369e6389c8dc3618f9ce5a84397112f59d59536cad6a738b
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3