Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a54452f94785d9f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-07 16:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fdd3cdb90cc835e3c9022418d57b6c40 SHA-1: 7e2769e87ea946dc4c010d19c768eaa2c014d9dd SHA-256: 9a54452f94785d9f9bb8a8679b61032dcdccc1f39d3d80a1f8420c2110a53ab8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

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://smidgel.ru/pbw?utm_term=at+what+speed+do+airbags+deploy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458849/normal_600b344c7e170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fcf4d0e587ba.pdfIn PDF document text
    • https://dijozigi.weebly.com/uploads/1/3/4/7/134748041/ximetelodikupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fe7b38ea19c3.pdfIn PDF document text
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/jojojivigekike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5fc9c081224b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_6040b070e1a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_604362ecc51a2.pdfIn PDF document text
    • https://wajuzupupadajo.weebly.com/uploads/1/3/4/7/134752236/4eea2249d72cb9.pdfIn PDF document text
    • https://luredirimepopes.weebly.com/uploads/1/3/4/5/134590269/kavumefomoz-talesuwapetege-zalowegorufonug.pdfIn PDF document text
    • https://fudopelotavag.weebly.com/uploads/1/3/5/3/135325828/nonalikunololom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikovifif.pbworks.com/f/72460360781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b53d8e0-e0a6-46b0-96ba-58fb2ee21784/dikapolewexuwabotovavoj.pdfIn PDF document text
    • http://deduxofevit.pbworks.com/f/how_to_give_power_of_attorney_from_uk_to_india.pdfIn PDF document text
    • http://tosuvop.pbworks.com/w/file/fetch/144557688/whirlpool_gold_series_refrigerator_control_panel_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512105ce-50ec-4850-9752-90f3ee4c39c4/83747490099.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 5544 bytes
SHA-256: 7f5438b0f6a31dd60d4d61ba49fb8538a79871517feb2c60531a57c018112ab1
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 10584 bytes
SHA-256: 079bd05fd5ca05e6cb0c199f2bccd0d8b4039586f3d4f73ad384f99680ff3623

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