Malicious PDF — malware analysis report

Static analysis result for SHA-256 af003e8eee2cde5a…

MALICIOUS

PDF

72.9 KB Created: 2020-12-16 18:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4102c04b8f0d375c4887becf04917d80 SHA-1: 192ff3930e029c0fdd6af25b169a92ffe31d8fdb SHA-256: af003e8eee2cde5a84b81c66c78850e17b364c8c34e9719d16d87d5014aeba3d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a mass external PDF link farm, with 30 links pointing to various PDFs. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to potentially harmful content or for malicious SEO purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=networking+interview+questions+and+answers+tutorialspoint PDF link annotation
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/bivodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f8b406f77ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fa71afbbdf61.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/noserawodoz-janavovaxeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5fa25668b591f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fb2ec3dad13d.pdfIn PDF document text
    • https://guxelopadak.weebly.com/uploads/1/3/4/7/134727887/tidafugatirufiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_5fa85859cd6bd.pdfIn PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/4734083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f9e4387c8244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fa31a8d01b7d.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/vivebekuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fcc38f78edc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f911ba4364b4.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/f220f413-5f92-43db-9450-3afbc5a3ca84/the_anarchist_cookbook_recipes_for_disaster.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/27957576374.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/21216235460.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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 5436 bytes
SHA-256: 555bf015ccc5da2354d805a959df6e1d530e6845fcc225be5aae266d789e8a0f
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 10316 bytes
SHA-256: f92a9988471b549719a0216de0e837c434d0bf233d26ef3942a383662a8598f6

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