Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f6bbedfd715e50…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 00:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 76c5a1e4c6f7ccdf497e4c477bfa9c99 SHA-1: 28b2e9387791d398e8a7a29533a65bf920de7685 SHA-256: d8f6bbedfd715e50b723ae3aa686619fcc46ccf907b32fafb833609dc872b961
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, likely as part of a phishing or scam campaign. The document body, though heavily obfuscated, contains text related to downloading question papers, suggesting a lure to trick users into accessing malicious content.

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://zajinet.ru/award?keyword=air+force+previous+year+question+paper+pdf+download PDF link annotation
    • https://maduvifodowemo.weebly.com/uploads/1/3/4/6/134692972/40c487.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/sexojogamirurupogujobudowo2ng0.pdfIn PDF document text
    • http://domsale.xyz/685266398362inha.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/zerigufuvix.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/conducting_research_literature_reviews_fink.pdfIn PDF document text
    • http://nonretloli.site/7638179067789am2.pdfIn PDF document text
    • https://kuxesilivalagi.weebly.com/uploads/1/3/5/9/135963561/falepalagepox.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/genetics_file.pdfIn PDF document text
    • https://dawirusopu.weebly.com/uploads/1/3/2/3/132303146/7615738d.pdfIn PDF document text
    • http://copyright-central-media.com/bureaucracy_in_sociologyz5f4a.pdfIn PDF document text
    • https://sulekigotama.weebly.com/uploads/1/3/4/3/134307446/c6171c811.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/diwejajipalude.pdfIn PDF document text
    • http://kzrovk.xyz/goliwotulopisawenewokawujgv1t9.pdfIn PDF document text
    • http://obmenkalnr.online/knife_set_sale_australiaig1b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_27361c22f47444cc83f8976ac5be489a.pdf?index=trueIn PDF document text
    • https://64395af2-4242-4e05-b369-c5cd74cd0025.filesusr.com/ugd/be19e1_7c90c4ae4d0a45ca97e99738fcf2933a.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_fce5ebb12e4c46e78ceffa0c8d020883.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_4736fa4db88b4ae5932d88bfce2f0fc7.pdf?index=trueIn PDF document text
    • http://vebagakid.onlinewebshop.net/sutulutavirukililuzaniv.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_33938f3e9cb2452699bbbc6a2d877f85.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_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 5520 bytes
SHA-256: b3c0715f4cb6068176fd746f36f942ffcecc43adf64c382d996ca3d9449f123a
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 11152 bytes
SHA-256: 71bb1f91d65f9c192a239a5629d4bfc17ad3b9dba71e792ba3224fe7462add69

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