Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e29b7a92583141…

MALICIOUS

PDF

71.3 KB Created: 2020-12-19 23:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ffc256d5fba851f2a8f504879414da8 SHA-1: 1ee0abf4a6dbb52cfadad3479a977feb11e06c7e SHA-256: 05e29b7a9258314159aec8d5dd89af723c489ba3ed9f1a3aedbe5449aefbc3ef
244 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with several pointing to known malicious redirectors and a link farm hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to malicious content, rather than direct execution of a payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://cctraff.ru/123?utm_term=wordcount+mapreduce+example+python
    • https://niwurepezexeted.weebly.com/uploads/1/3/5/3/135312419/barotus.pdf
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/fimuf.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/fenixaxitimitomowub.pdf
    • https://juleladenoduko.weebly.com/uploads/1/3/4/4/134478401/susugol_zabajosiboruwa_xaman.pdf
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/9216251.pdf
    • https://xukopalobupekon.weebly.com/uploads/1/3/4/7/134730613/xugufozovifam-jidukefo-satuludarito-kewawufodeveber.pdf
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/zinutamuxuresibiw.pdf
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/wawesu_xidavu_pawunudug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wemupajese/lusavigizite.pdf
    • https://uploads.strikinglycdn.com/files/34936eaa-365f-415a-b2bf-14ee303a5b3c/le_royaume_de_kensuk_rsu.pdf
    • https://uploads.strikinglycdn.com/files/d0bc5905-9d35-4df4-a9bc-b3b8d9de9f50/nidujejideveteli.pdf
    • https://s3.amazonaws.com/dudigonifu/vizobuvixodaki.pdf
    • https://uploads.strikinglycdn.com/files/7bfb7e96-33fb-4b83-9ea3-8b24a0bda172/auto_affection_protection.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_off0000d4f0.bin
f5ca71497666cb08ebeeb46ad8ed8db693354ef7a0543d6b881ae6e50ec9951c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 5320 bytes
font_01_sfnt_off0000e6ec.bin
17f2a0cd4d6b55255fec9218e7e4c2f36263c054c611057088b36dd6348d3097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 12652 bytes

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