Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a33886c577480c4…

MALICIOUS

PDF

66.4 KB Created: 2020-11-14 09:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ca9dbd2e609efe8d3f6c24809d4052d0 SHA-1: db98058ee1cdb51977bcfc34078080c3454911e3 SHA-256: 7a33886c577480c4cda308874cbaf02477d78d0d7a796c8f926583f309c867af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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=broken+age+hexipal+wiring+guide PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/mipak.pdfIn PDF document text
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/8757590.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/1ca126d.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/gakifuvakiveten_takojeros_gutafilusobifa_bokuvutepaxe.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/1089757.pdfIn PDF document text
    • https://puliwavigajog.weebly.com/uploads/1/3/4/4/134469254/8c7eac7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/2002_ap_stats_multiple_choice_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22574d45-1f0d-4ae5-aec6-18e9270a131d/38019878139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a8abe9-761f-4ebe-89a2-448d46944c89/ak_ve_cazibe_akademisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94acfb02-546a-451f-ad31-90b87882c7dd/84972553766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7037c56e-7403-4cbe-bd7a-a9acb8e0247e/fakokosinolid.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_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 5316 bytes
SHA-256: b19b237cc1ac4882bdd075959c8eceff85b31111aebe7647645aa37609e75b40
font_01_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 10956 bytes
SHA-256: 0e97733bcb610967a1fad92ea11a354fc5f9e85944fa4d930f02622bade3b796

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