Malicious PDF — malware analysis report

Static analysis result for SHA-256 35baa6b5411520a6…

MALICIOUS

PDF

68.6 KB Created: 2020-11-26 15:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbce6b64207b89e7c400561aa51ffbf4 SHA-1: d57603e1113156e2b50ffeeac08310938350a107 SHA-256: 35baa6b5411520a6ca0d02422a821579c3f5f74d2898550c9f3d5ed7d597d4f4
214 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 a critical heuristic firing for linking to known malicious redirector infrastructure. The embedded URL leads to a site that appears to be part of a link farm, likely intended to drive traffic to other malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=skyrim+silent+moon+camp+location+map
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/680203.pdf
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/sedoxij.pdf
    • https://cdn-cms.f-static.net/uploads/4486563/normal_5fb7bd7f58d0f.pdf
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/1305958.pdf
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5f988972df709.pdf
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fb86fafc9772.pdf
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/2117092.pdf
    • https://mupaxeruzu.weebly.com/uploads/1/3/4/5/134597089/c2a2a83af.pdf
    • https://cdn-cms.f-static.net/uploads/4474727/normal_5faa7a80e9cd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memobofilenabon/corrosive_agent_ingestion_guideline.pdf
    • https://uploads.strikinglycdn.com/files/2dc8e400-4322-45de-8556-d440f65450eb/lajilewusukulibuvogajog.pdf
    • https://uploads.strikinglycdn.com/files/2f910217-b435-43f8-8d26-ffdb730f4dc0/nba_2k20_soundtrack_songs_list.pdf
    • https://s3.amazonaws.com/debiwelof/67648793166.pdf
    • https://s3.amazonaws.com/luborinizu/cpt_2019_practice.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_off0000d056.bin
10070abbcb7e04bbb295782b471f133642b39519b5def679dab5e0440482756e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 5348 bytes
font_01_sfnt_off0000e27c.bin
82fec73b97b0b8b994b604b2e5ab6631c7119a5a588310d7b38c3b4e9fa0a6db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10232 bytes

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