Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fbd38d6d415627…

MALICIOUS

PDF

49.8 KB Created: 2020-11-08 15:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 07f921f70637788d2f232b9e559075b2 SHA-1: e2f4e45b0cedc942c96fdd6f1f651942ac72d886 SHA-256: c5fbd38d6d415627dbc30f2d11ca7e7ff5aab7d22ecf570400925ead660932bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary URL extracted, 'https://trafficel.ru/123?keyword=star+food+by+ethan+canin+pdf', suggests a lure based on a book title. While no scripts were directly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to drive traffic to malicious or deceptive websites, potentially as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/123?keyword=star+food+by+ethan+canin+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5f938cd972d8c.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/065901c90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f9e304fbe698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://riroxoposej.files.wordpress.com/2020/11/37722151615.pdfIn PDF document text
    • https://finasaz.files.wordpress.com/2020/11/33669283505.pdfIn PDF document text
    • https://xoxedoxiki.files.wordpress.com/2020/11/original_unveiled_mysteries_guy_ballard.pdfIn PDF document text
    • https://wisunin.files.wordpress.com/2020/11/zimebigi.pdfIn PDF document text
    • https://karepoxazul.files.wordpress.com/2020/11/xumamosudokemamulired.pdfIn PDF document text
    • https://bejafasuba.files.wordpress.com/2020/11/44120928770.pdfIn PDF document text
    • https://luripug.files.wordpress.com/2020/11/introduction_to_aircraft_flight_dynamics.pdfIn PDF document text
    • https://dorokani.files.wordpress.com/2020/11/ielts_band_9_essays.pdfIn PDF document text
    • https://somopewikiga768872658.files.wordpress.com/2020/11/81918655943.pdfIn PDF document text
    • https://jojabowux841055970.files.wordpress.com/2020/11/alien_races_book.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_off0000851b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851B 5376 bytes
SHA-256: 1c0ac2ab589a4c22bf4777ac66b436682c825b81337e32f2f22badf8e01978d6
font_01_sfnt_off00009766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9766 10428 bytes
SHA-256: 6b92b6d3162d849c95a31e25615975d8acf5a66d0eb54a4077300e0ddac4c935

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