Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c151242910cb1e4…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 08:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b9f73b05a94f774b95b270df52e597ae SHA-1: 460ac0a9fc2eeb7c31ca0ce7699698ebfde99cbc SHA-256: 0c151242910cb1e42ef9e27dc73735dbc9de160ce868b1ccfdbd1213a250a937
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The embedded URL and the document body suggest a lure related to a 'mechanical psychometric test pdf'. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely for SEO spam or phishing, and ClamAV detected it as Pdf.Phishing.Trojan.

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
  • 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://jumiwimov.ru/award?keyword=mechanical+psychometric+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447669/normal_60619aec318b0.pdfIn PDF document text
    • http://lireveputejat.iblogger.org/zizuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_6007eec0e9c48.pdfIn PDF document text
    • http://filopibat.22web.org/mitunizatez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_601c7972853c0.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/rovuweraja/illuminated_manuscript_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d05088-b0de-4e86-af7b-daa90b978aa8/blood_bowl_2_teams_guide.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_c24afa54b3f54bd7a94157bf68091df2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/agno3__nh3_d_hin_tng.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c738037e-1d91-4153-9f01-94f045e8c181/lenovo_t510_user_guide.pdfIn PDF document text
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_ed0a772881a047f6a06f749aec3d6d12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fd1e49-8a18-41e2-a99c-2e255e8e8d90/94186149682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef4fd5f-1a8b-448e-bdd4-8d0e6e79131c/4075691412.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_11fca59d6aee48c981646b73772b761a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/which_of_the_following_is_most_likely_to_be_associated_with_a_confined_aquifer.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/66837364674.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_9968b1dc4935462ba9048a5bd23603b1.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_ac108e683d084e2aba3f793f27ad72d7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 5500 bytes
SHA-256: a8297c13151c1b5aa672f3b9779fbbda469d6fe63e162fc88c0433857690ca28
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 11008 bytes
SHA-256: f7b87a54119bbac00a9b8b0a44d26b44da4e79c520d8efdc3c48518281b0ec08

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