Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f404d0d03d60844…

MALICIOUS

PDF

71.3 KB Created: 2020-11-20 08:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7b90effd9f5cb40746f27981117d204e SHA-1: 1c2dfe8cba3fd3642a36dc2cd66ece58981ef297 SHA-256: 8f404d0d03d60844cecbb9bf9e486662b1016c6a9158a9ab39b55d5aa1c997be
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a suspicious domain 'traffine.ru'. Although no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest malicious intent, likely to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=pythagorean+theorem+worksheet+word+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f9821214919a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fa46f3c1f00b.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/9972327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5faaf6cbbadef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5fa9e153b2793.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/7323743.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/510c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tedowafomaru/nissan_50_forklift_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/nesijazimilikovagetoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3854731d-358a-4c45-a4d6-e39039b81d07/mom_son_topless.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/78967853403.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/cambridge_dictionary_advanced_learners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207f6de3-995c-4cd3-a14d-941906bc0ead/gepemuzosax.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/ku_study_abroad_cost.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 5512 bytes
SHA-256: 7b936446cd3403b42f9941bd4fb6781088582e4c536d75221c69ebcc53101657
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10600 bytes
SHA-256: 1c172f95dea0a5eec7a9cf670a69ae86dc2054befff98ab8fd96787387996ec7
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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