Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ef35f7e6ff0281…

MALICIOUS

PDF

81.8 KB Created: 2021-03-14 00:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c42d3329fcd4652a9a975293cd240c22 SHA-1: a27855f745652445bafd482b523bd97c807167a7 SHA-256: f8ef35f7e6ff0281f622603479942076eabe4e1e141981b5df5fd8af156fb43e
126 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 phishing or trojan threat. It contains numerous embedded URLs, including one that redirects to a suspicious domain ('fokemale.ru') with a search query as a parameter, suggesting a phishing lure. Another embedded URL points to a link farm on disposable hosting, further reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=where+does+the+sim+card+go+in+an+alcatel+phone PDF link annotation
    • http://hermidkovo.info/17362897455jn07m.pdfIn PDF document text
    • https://cdn.sqhk.co/mozozezowos/ZgjhaLZ/beat_the_boss_4_throw_5_fireworks.pdfIn PDF document text
    • http://optamorem.com/fonumipawidubm7l9o.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/d4kihjh/miga_town_my_hospital_apk.pdfIn PDF document text
    • http://ygrash.website/nuxolez5d6u.pdfIn PDF document text
    • http://thiswaytovogue.com/gonna_party_like_its_your_birthday_gifsomtf.pdfIn PDF document text
    • http://cg-designer.xyz/ubuntu_auf_usb_stickbsbua.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://uploads.strikinglycdn.com/files/5788e101-8d07-4443-a1b4-bd20a0d083a7/91671970688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d997b54-ab87-48dd-81a0-61b1425f4125/jazodarupuwip.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/dokovularelimomituniri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19193d02-7c4e-4651-8190-46119ba64348/83635109419.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/91571687702.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/43437981003.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/72770422443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df56318-123e-4828-a6fa-b89cdf8a306a/10588928987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ac457d-b8dc-4493-8005-eba9ebb487fb/wetejo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 5288 bytes
SHA-256: a4a505c76265a752595e4ab416cdd870ef73f80d73b1af5a44bba3e1053f4fd5
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 10564 bytes
SHA-256: 584ad8d5943a1d8b4736d4292c13f990e2298d601e47c0a63f6741afd71089de
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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