Malicious PDF — malware analysis report

Static analysis result for SHA-256 7536497cd9e4e2ff…

MALICIOUS

PDF

67.8 KB Created: 2020-12-07 08:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a3468388378992d5b0b810135a431d76 SHA-1: 74fd350473e2f2379c3c4d4a34a1a6d6d7f2a842 SHA-256: 7536497cd9e4e2ffde915f96a7a6d45c9bf119dab074f640edfef8bde4423e94
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to a known malicious redirector and others hosted on disposable infrastructure, suggesting a phishing or scam campaign. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=victory+celebration+sheet+music In PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/104505.pdfIn PDF document text
    • https://rubuxunixo.weebly.com/uploads/1/3/4/5/134518382/zitotufizafolufokobo.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/29e3df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fbc80c629654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_5fa5b81a1d415.pdfIn PDF document text
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/gebojawizof_gapozi_gifodemilimovet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_5fb2801faaa52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fc7d635e84c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fa570ca6649b.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/9634554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_5faf7294277f3.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/f16fd2bc-2769-407d-96a2-877823f55589/dads_swim_club_coaches.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/3227775213.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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 5244 bytes
SHA-256: 09ce57bd71c5b9da7063810ec7a6707779ec9d354a5b134ca07f12ec6896b40d
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 10560 bytes
SHA-256: 6dc5d4982540b786c5f97eefe93fd521dd9be502cdf322607cec00e90ee1a864

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