Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0841edc068e096d…

MALICIOUS

PDF

69.5 KB Created: 2020-12-21 18:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fd29c63d21d1be9f4c4eea5c30e21dca SHA-1: cf194767bf99fd706b3b90d778318decc2dabc4f SHA-256: a0841edc068e096de879355214de9be1fec5dacb9797972c9e9e1a824587f244
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV also strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/wb?keyword=bingo%20nights%20near%20me In PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/gububo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5fa07971a68b1.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/jigisipejutokege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_5fb9848b525d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f8efd7cb85bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5fac2df346643.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/zimika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fd673e94f8b1.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/jopibimufanoka-dogukali.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/4854e63f9.pdfIn PDF document text
    • https://gedevuxezupimot.weebly.com/uploads/1/3/4/8/134884710/3ffb0f2874256.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://static1.squarespace.com/static/5fdd379fff074777c983261b/t/5fde4564e64f570315239a66/1608402277424/new_bhutanese_video_song.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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 4904 bytes
SHA-256: 624c36825f4e59013c2868a51188c79499c460fc511278e89291e0f1071fd071
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 11272 bytes
SHA-256: 7b1476118bd46e9199e60d286b0d91d9d8b69b5612cf41ca06bc937a9c98e5d1
font_02_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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