Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d7c1cd8916443d…

MALICIOUS

PDF

74.2 KB Created: 2020-12-26 03:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8016b2215c9538345471dfd13367c3f8 SHA-1: 1f095fd06279344b738f5970efaac7e8c2687704 SHA-256: 36d7c1cd8916443dd23af745736f4a4f9d6d9c726a0c2c4e9e77ed04df96aaa4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term=red+color+amaze' in one of the URLs indicates a tracking parameter, common in phishing or scam campaigns. No scripts were extracted, but the PDF structure itself is used to host and link to other malicious content.

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
  • 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://trafffi.ru/strik?utm_term=red+color+amaze PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f8e70b475c54.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/bogajip-febub.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/5197923.pdfIn PDF document text
    • https://cdn.sqhk.co/navezige/1TjbjhM/56897946346.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/8531254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f915b734a951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5fe1ca8c5deb3.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/birapibavu.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/TEQ0iij/snake_island_movie_in_tamil_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5fbca3ea4b0bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fdfa322800eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_5f9ed42933906.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/dheiahi/zemebaja.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/443614c4-a49c-4d36-bd83-2909c665537c/psychology_applied_to_modern_life_11.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_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 4964 bytes
SHA-256: 2015d5d4836cc78792ec184e110a395c89ad28c3fc99230e8c896d7d6fa7270b
font_02_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 11832 bytes
SHA-256: 72761b510d16144099e6131e3c377729e3ba1c876694d94360a8d7574fc4c3bf

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