Malicious PDF — malware analysis report

Static analysis result for SHA-256 2328768b02bc0f49…

MALICIOUS

PDF

78.5 KB Created: 2020-12-06 10:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 98ee3d4a0fd33b4b82efb95d27b9722a SHA-1: 1844141a62502fcbe36258d8d32b6486c1325201 SHA-256: 2328768b02bc0f498e0894afbc54e987d1db37e6eda8e3fa8c4784cfb5cdb120
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. ClamAV detection and an ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=patrick+mahomes+parents+image In PDF document text
    • https://metipejoxeve.weebly.com/uploads/1/3/4/7/134725173/xigunotej-fatolabufiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5f9df2a62a514.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://duloduwo.weebly.com/uploads/1/3/4/8/134850843/96f9fe2dd20.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/542178.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/sofik_jerisaxezeli_duzumade.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/tuvofob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5fc3adcc26094.pdfIn PDF document text
    • https://mupaxezofede.weebly.com/uploads/1/3/4/3/134317166/2045939.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/4124283f7158.pdfIn PDF document text
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/6041430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc14701c6229360ecaf89c9/t/5fc5baae6457125654027e91/1606793903208/cervical_myofascial_pain_syndrome_headaches.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/animals_martin_garrix_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/lumiritopejo.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_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 5380 bytes
SHA-256: 4472bafe73b552410b1b6554f8c2fae2bdd8047354b239b87351a25d83349d10
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 11008 bytes
SHA-256: 2720380f6c26c008b3ba5e0d291d8b145e65fbd8177d50709d4c3563255499a2

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