Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dc4e620d6127db…

MALICIOUS

PDF

81.5 KB Created: 2021-05-30 05:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3e7076d1b34617093fd117ca92252e24 SHA-1: 23cd4712db50e5658f9737b949072883ff20a4cf SHA-256: 98dc4e620d6127dbbadbe8aea8fa9a790b37eb683e68eed5d1a4911abe8effb2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM strongly suggest this document is part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=yalanc%25C4%25B1n%25C4%25B1n+beden+dili+pdf PDF link annotation
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/5000983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_600e84e415058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_6011f84aba34f.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/f4660e68f09.pdfIn PDF document text
    • https://gizepigonezes.weebly.com/uploads/1/3/4/9/134901759/8fecb1e3762f8b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_60047f059be83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_606e15158daa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_60543d4e9f8f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_600fc97a83b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_60246fae85cff.pdfIn PDF document text
    • https://divulonuwuw.weebly.com/uploads/1/3/1/4/131482828/zagabevazita-kugemomolox-javelapore-lisawatatuwur.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/4840808.pdfIn PDF document text
    • https://fewupebotugap.weebly.com/uploads/1/3/0/7/130739906/dcbd83695192.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/vidulevej_mijilofijato.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/tubunegodakirar.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/wujeg.pdfIn PDF document text
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/5a12a112bd.pdfIn PDF document text
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/1326666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_6048fa4c3f41d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/90028c07-81fa-4bf3-a381-dcb9f320c020/85151302736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8539f91c-9f18-439f-ac0e-c6cd1091f654/emergency_medicine_resident_salary_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da470f1e-4dfd-4ff6-911b-2e1b76106085/how_to_install_sd_card_in_roku_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7a72b6-a686-42a5-bb4e-9ee28d19cd37/goliwiwaxajikogetupos.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_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 5008 bytes
SHA-256: df7121017ac84a1d3f03679b06605a2bd91a91e903dbfb6fdc5bcf4522a2764f
font_01_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 11972 bytes
SHA-256: f3ef9f3e10c620043954e29718465d951169e6749946ecc9e3ae3d62df7533d7