Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e8ee0c752a751c…

MALICIOUS

PDF

86.7 KB Created: 2021-03-29 02:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 4bc9b58a9b3aef55cb5778ca691afc84 SHA-1: 72158643680eefe4acce722443f2b4cf796c9400 SHA-256: 16e8ee0c752a751c9b702a5ee565723419df26445a6bf7372b296cb0f13e11c6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://pelibifir.ru/award?keyword=martyrdom+of+polycarp+pdf PDF link annotation
    • https://cdn.sqhk.co/jisaside/gfnhahf/52026764359.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/jghYgeR/standard_address_format_canada.pdfIn PDF document text
    • http://mazezoda.22web.org/common_acids_and_bases_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_5fdd3991383a8.pdfIn PDF document text
    • https://cdn.sqhk.co/mekekomubun/xjgCjfl/green_panda_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/C9ghsha/8248600096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_60339e83b266e.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/nokiva/jatunudevudejimuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/carraro_axle_parts.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_415eae7433fa460e990cd65af51587f9.pdf?index=trueIn PDF document text
    • http://zefupolegemawak.rf.gd/tavebe.pdfIn PDF document text
    • http://duwujedop.rf.gd/cuisinart_coffee_maker_dcc_3200_manual.pdfIn PDF document text
    • http://feramivo.rf.gd/guidebooks_to_sin.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_a5deb8db9efe4ccc858dc1a302858284.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/how_to_answer_tell_me_about_yourself_in_an_interview_for_fresh_graduate.pdfIn PDF document text
    • http://gawusozuf.epizy.com/27683623955.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_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 5228 bytes
SHA-256: 8ee7a7c078dbc7e3e2cf32937ecc31237f03f1a63fb22a9c63c73bfeb11881cd
font_01_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 10952 bytes
SHA-256: 590561560061e094a3d394c58ba4beec42a8302f5f2823655e08fef050037b64

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