Malicious PDF — malware analysis report

Static analysis result for SHA-256 256af7cb874b2ab3…

MALICIOUS

PDF

69.5 KB Created: 2020-12-28 18:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 235f9fc520e3b37ce358ce0a8ed213c3 SHA-1: bfefe0b86ca8f2f9f469d13b82871424208449b6 SHA-256: 256af7cb874b2ab314d9eea0aa5e834f8781e1de2447120b9077e502d8e74f3b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'HMRC VAT refund' and 'contact number', which is a common lure for phishing scams. The presence of embedded URLs further supports the attack pattern of redirecting users to malicious sites.

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
  • 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://traffine.ru/strik?utm_term=hmrc+vat+refund+contact+number PDF link annotation
    • https://cdn.sqhk.co/vuzefegevo/dXXic8X/new_york_guided_walking_tours.pdfIn PDF document text
    • https://cdn.sqhk.co/varipivokil/Sw1OFTW/43355729422.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/ijfhf2k/12967409656.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/novunoruzifusetedi.pdfIn PDF document text
    • https://bedusetifimanov.weebly.com/uploads/1/3/4/8/134846759/3633164208.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/larinufuzexamatiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fb01a4642427.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/fhavghd/87457809686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fca60837f0de.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/eaa1c212-40c3-472f-a179-b90746c73943/hyundai_elantra_tire_pressure_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c09ffcf-0def-44fd-9b13-4d33b13fdf40/62619653777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fb365f-7987-4c93-a33d-df844e49719e/63922584370.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/57615751226.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/xelunutisudubugetaroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fba9c0c-8a19-428d-8bd8-e3036300c0ad/65171190701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192c09cd-108c-4143-8cd7-751403e2b7b6/7293024389.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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 5120 bytes
SHA-256: 981fa158e02e2ec3a8db81069fb2091a41dfb93b9e0b4d7f9aeefc6dda4d17d9
font_01_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 11124 bytes
SHA-256: 96341cb85ee5d5fbfe8e0989958ddeeba081cec4e4a4d87b5b75736fb09b6512

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