Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcd181dab422c72…

MALICIOUS

PDF

66.1 KB Created: 2021-01-15 23:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 06057b284b83f62b8849baf58b51c2e0 SHA-1: b536b619edab0ac8657432ea8bc0a6ff05a8520a SHA-256: 7fcd181dab422c722cf46faf9460bf7d3d4bb34a7c4d89c03d4569ee31b0654c
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for malicious redirector links and a link farm. The document contains a large number of embedded URLs pointing to disposable hosting and redirector services, indicating a likely phishing or malware distribution attempt. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://gettraff.ru/123?utm_term=pastor+allen+jackson+ministries In PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/xitesuseda-sorudigarowatuj-rividufesida-julewit.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/ickgfgi/42473405289.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/nufepisebe.pdfIn PDF document text
    • https://site-1174473.mozfiles.com/files/1174473/time_surfer_ios.pdfIn PDF document text
    • https://kipamafulu.weebly.com/uploads/1/3/4/5/134588126/tafuvamiz.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/5303352.pdfIn PDF document text
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/edcd53b.pdfIn PDF document text
    • https://site-1177340.mozfiles.com/files/1177340/words_that_start_with_e_for_toddlers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_5fe778c4bfa41.pdfIn PDF document text
    • https://roginolesalit.weebly.com/uploads/1/3/1/6/131636974/1951f744e0015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 5088 bytes
SHA-256: 638512b9cfea9f39e0541ed15719a6b5502feed004424fc7c1faf9769adf7df6
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 10092 bytes
SHA-256: 83fe38c746cd13ff3e7622e9eddc57b64b86756bb9b8b28ae1ab504484564677

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