Malicious PDF — malware analysis report

Static analysis result for SHA-256 16678841329d2511…

MALICIOUS

PDF

69.2 KB Created: 2020-12-18 02:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 88adab8a8f06700f84ad7f67ea82b7e3 SHA-1: 16d0279a005554b8aef93664c9f5f6ad1a74df42 SHA-256: 16678841329d2511279dfdf7e4434849bec4808c69b7ed809194d66696a432ce
244 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, and it contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/aws?utm_term=aimplb+full+form'. The file also functions as a link farm, pointing to 30 external PDF files hosted on various domains, suggesting an attempt to distribute or chain malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

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://ggtraff.ru/aws?utm_term=aimplb+full+form In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fad7e9ad1ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5fd9b32bbb663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc8e5b68c715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fd1f23c0ebb0.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/vevomavesuxig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fd1ab86ad6fd.pdfIn PDF document text
    • https://paxavolufogese.weebly.com/uploads/1/3/4/6/134600391/4785129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5f95657da7db7.pdfIn PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/rosunoma-xuronizoxomupi.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/3469449.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/3c12b3d5-ee7d-461b-83fc-4764e49028d0/idpa_target_stage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b59fa8-8121-4e69-9eff-0fac7f1214af/90664391604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2df8ff-ff06-4d54-8798-66fb7dd71080/wipilemurulolovosetawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46219b4b-3018-4adf-85b1-205a08aa4809/37311061925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1150cc7-84e5-4ee5-857b-77170191da77/bizedetitalevumalamirit.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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 4788 bytes
SHA-256: b8fc313b306e2841c6dad55f5803ad95d1f841991189ea38629299d1f7f5d0cf
font_01_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 10988 bytes
SHA-256: 208f48698d6ca4e043a230dbb0ed1ca61a1ca937dfd66121714ffd0cdb517cfd

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