Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d28db2969dadd6…

MALICIOUS

PDF

69.2 KB Created: 2020-11-20 05:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: acfafe96811f0687543e73e6b26eb813 SHA-1: bdd74f0ae2a73df73676505126abbeefedbc29b6 SHA-256: 28d28db2969dadd67fcd24168bdf7fb47f06a2c9de5fc8c8ba20ece73e541f17
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external links, many hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the presence of a large number of external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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://traffset.ru/strik?utm_term=pioneer+vsx-522-k+price PDF link annotation
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/12667c0530ba008.pdfIn PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/rijajiwuxorat.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/gidafeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5faafd20131e1.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/5047893.pdfIn PDF document text
    • https://guxodovuze.weebly.com/uploads/1/3/4/3/134333652/a9954c8.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/rojaduwabowiw.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/575308.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/5690176.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://s3.amazonaws.com/garorowa/72121624311.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/sagemcom_router_dns.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/20271930372.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_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 4872 bytes
SHA-256: 1f0766d77f8d3821b2f7d04c5aa821ff429f79b7ec9590418cb4991c133bdd34
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 10920 bytes
SHA-256: 0730e6320a1c0283ce07ce57625e7f760cdbdebd248be3213bf9db67eb022d97
font_02_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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