Malicious PDF — malware analysis report

Static analysis result for SHA-256 b275934356dd7bc3…

MALICIOUS

PDF

77.7 KB Created: 2021-01-11 07:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fa48ba7f7122d2ad600f5b4a2cce058d SHA-1: c4760ec09c7bd8b6ce7cd8103e85e63e4fced0e3 SHA-256: b275934356dd7bc3619dc59671fd3f527fc72114644402603853bf854f835bbb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute further malicious content. The document body is heavily obfuscated and appears to be largely junk data, reinforcing the non-legitimate purpose of the file.

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://trafffi.ru/aws?utm_term=dover+beach+poetry+analysis+answers PDF link annotation
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/taluvifilakoweka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5fb5b28de541d.pdfIn PDF document text
    • https://site-1175456.mozfiles.com/files/1175456/crossword_puzzle_books_near_me.pdfIn PDF document text
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/pakavanumi.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/4bcf76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_5fa215170e5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8e35e5a6d6e.pdfIn PDF document text
    • https://site-1177944.mozfiles.com/files/1177944/run_sausage_legend_shooting_games_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f8f236e65a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5fee392a10793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fb2e18da9b2a.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/768d5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 5412 bytes
SHA-256: 88c1c777b7dc9f51a783be08edd9269b985bd4e5e61ffee994961b2dddf92512
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10608 bytes
SHA-256: dff3b52e05768cf5656c9b36a7533ad46435237bc0f23b60f266db8e5e67a295

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