Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6b1f45bb39e467…

MALICIOUS

PDF

76.8 KB Created: 2021-04-07 19:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8966a571946a3cf41f1bd7d5c4c50aff SHA-1: 6ad757a425cdf4e6872b3620d552ce6ce5eaf871 SHA-256: af6b1f45bb39e46731871eb5ffe78a9bf38e00847659371960bd1436bc2c17e1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the true destination through multiple redirects and disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=yes%252Fno%252Fmaybe+list+excel PDF link annotation
    • http://fevevafo.medianewsonline.com/40933088171.pdfIn PDF document text
    • http://mebelintera.ru/is_the_texas_cdl_test_hard455bb.pdfIn PDF document text
    • http://reform-st.ru/86002363344vbmp5.pdfIn PDF document text
    • http://itanto.space/82129447989ilmhz.pdfIn PDF document text
    • http://help-verification.com/bootstrap_div_class_form-_groupncr57.pdfIn PDF document text
    • http://uplrezina.site/how_to_reset_sportdog_bark_collarke2bu.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/14628141976.pdfIn PDF document text
    • http://ionatr.fun/modern_portfolio_theory_and_investment_analysis_9th_editionqypdu.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/pamosesubia4rx2.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/50811877347.pdfIn PDF document text
    • http://parrrtner.xyz/world_market_rugs_9x12jxxpu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a250f7-9ff4-40f3-9ff5-5324eecb5402/used_craftsman_dyt_4000_riding_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77afe49-e72b-4a81-9df5-7021521910a8/how_does_the_cycleops_fluid_2_trainer_work.pdfIn PDF document text
    • http://rorufefujolag.rf.gd/41328739674.pdfIn PDF document text
    • http://zujapataluzipo.epizy.com/allegory_of_the_cave_book_7.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/youll_be_okay_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396338ff-dfc2-468b-a3c9-22b98079cb27/xotuwajavolosavazelulato.pdfIn PDF document text
    • http://vafatosiwajufo.epizy.com/courts_of_heaven_prayer_for_healing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcccde51-7086-4316-9d32-eaa26bf858f6/the_chemistry_brand_hand_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14eeafcf-0f52-4c57-94a9-361d40e0eef1/mason_county_local_rules.pdfIn PDF document text
    • http://fugubujilaxi.epizy.com/stormcast_eternals.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/cookery_10_pretest_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/23759795743.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_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 5156 bytes
SHA-256: b51334468b97b3eaf5307ed694499b2875d8c130c47b9a4268c4d9ae233f7856
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 11468 bytes
SHA-256: 63aa2cc71936cac23aa76b2cbe5a802fbfd235606a5485fd0847d75c206fb93c