Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9cd7e4d2c00c56…

MALICIOUS

PDF

63.1 KB Created: 2020-11-19 09:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61ad962e1201fc4eca0a10ed2aff5a14 SHA-1: d56652ee6ae708cbc7540c6a594975d040463685 SHA-256: 8a9cd7e4d2c00c568116faa77a06e1a8dec9db77e58033aa736240a7e2a8d8ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or SEO link farm. It contains numerous external links, with one prominent URL being https://trafffi.ru/123?utm_term=the+absent+author+pdf+free. The document's structure suggests it's designed to redirect users to a large number of other PDF documents, likely for malicious purposes such as SEO manipulation or hosting further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=the+absent+author+pdf+free
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5fb48801eba88.pdf
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/kunolakisosamuxexe.pdf
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/6771171.pdf
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fa4b50bb18f9.pdf
    • https://wubaruduxosekur.weebly.com/uploads/1/3/4/4/134484821/reweve_padas_guvovofob_kutapekusinoj.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/tagejuvutotiriv_beboko.pdf
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/zofifamumov.pdf
    • https://sofuwikomu.weebly.com/uploads/1/3/4/3/134308783/4320e4.pdf
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5f99bb0562ce9.pdf
    • https://cdn-cms.f-static.net/uploads/4460457/normal_5fa5a45457182.pdf
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f8b4f0f34631.pdf
    • https://nigokozop.weebly.com/uploads/1/3/4/4/134436215/pekakinuvesu-gixigo-jugovemudo-jiriwokagerovi.pdf
    • https://cdn-cms.f-static.net/uploads/4450440/normal_5fa977bb836e4.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/9025451.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f6d625f4-6b2f-4d9d-8d11-a3e5c3d80dae/iphone_6_plus_circuit_diagram.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b94a.bin
2d72aec23eca43a28a703abd1ed9dc9d3f4bb02d06f663f492a878a819b14fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 5188 bytes
font_01_sfnt_off0000cadc.bin
b8c64016bf694c3c03a0b1cbb4f1f574d507242737b9b07701a77669fac48fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 10444 bytes

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