Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35cc028146cf2c0…

MALICIOUS

PDF

74.0 KB Created: 2020-11-20 03:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4f70d5b0ceae45e27d0d79accb282168 SHA-1: 27c54092dca2ed86ce9d5b8aa0d176ed34036ac8 SHA-256: c35cc028146cf2c01cc4520ac2b03f78b40938c666ff078c9ac3cfe5fa7c1e46
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to these external resources, which may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=basic+c+programs+list+pdf PDF link annotation
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/xeguze.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/wapon.pdfIn PDF document text
    • https://bamupenasod.weebly.com/uploads/1/3/1/4/131410012/66b5755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5f9d7985acfef.pdfIn PDF document text
    • https://sinosawalebito.weebly.com/uploads/1/3/4/6/134663044/5072bb17db.pdfIn PDF document text
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/javujitozudalizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f9a98c3d87c0.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/5684481.pdfIn PDF document text
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/d53d91d4b.pdfIn PDF document text
    • https://vemifibu.weebly.com/uploads/1/3/4/3/134354414/2379190cd6d8f.pdfIn PDF document text
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/20f16e9d41455.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/e7cf5b70-5f16-4524-b47a-097d4b49cad2/jesus_bids_us_shine.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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 5088 bytes
SHA-256: bf9c206385f288a4f8f6a67f88945b27ab00aa92deb2a90483ec28f474e6d93e
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10368 bytes
SHA-256: ead3c278bdf537e3df12e2b3cdd2dfea22c0cb08a700454675af2587e930621e
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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