Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f634a53ba8380e…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 11:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a2ac425a8b6af1991c6dc28b0d68f52e SHA-1: 494cd2205853e4a9befc089c39161849689ec108 SHA-256: e2f634a53ba8380ecceebb4cc8f8837d0b384de56c5f3d871b554c32479fcdb9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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 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://leonvi.ru/123?utm_term=stained+glass+grinder+hobby+lobby PDF link annotation
    • http://bogplaktnc.fun/paturoxixalilvemf.pdfIn PDF document text
    • http://cosmosqrab.online/bubble_shooter_pc_freeiv1od.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/1Aijkha/xiwepojivagejo.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/i9Kjjff/lebusuxibetejirewuni.pdfIn PDF document text
    • http://by-roof.ru/97309183011qzx0a.pdfIn PDF document text
    • http://centerbluebadge.com/wegikatamovoteberubuwik6xi5n.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/jfgf4ha/56007184118.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hdjcijf/origami_lucky_star_paper_strips_size.pdfIn PDF document text
    • http://blablablacar.online/60608419355o7mj.pdfIn PDF document text
    • http://studyweb.site/foundations_of_nursing_7th_edition_s73gfx.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/cErggwb/22326532907.pdfIn PDF document text
    • http://app-3null.com/carotid_ultrasound_report_exampleq931i.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/hjhhnlm/new_scrabble_2_word_fun_games.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/brilliant_legacy_sub_indowb2yo.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/pXFu0ia/93463118036.pdfIn PDF document text
    • http://begemot.space/pagalworld_movies_2016_bollywoodv0a0y.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5432 bytes
SHA-256: 65473ba6871f31f7b541554be645827e27b7782b34c998296e8856e305850da2
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10828 bytes
SHA-256: 6e6aca638464c79615cca20bb4a3b90888ab6dba050f08fe27067a2e5b250a0a

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