Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cf569ef1a38446…

MALICIOUS

PDF

79.4 KB Created: 2021-03-03 03:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1337161b8429040405800675e64395f5 SHA-1: 8eaa9094a8426c222f974e5be228948c134b2a01 SHA-256: f0cf569ef1a38446b8060832e1347fc66c68afbc7a6e935e979b34a5f59e26a5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attempt.

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://midufefew.ru/award?keyword=homemade+wood+lathe+stand+plans PDF link annotation
    • http://kvrovk.xyz/what_is_literature_by_terry_eagleton_summary01k33.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/7566210.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/jowoz.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/343e284e.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/1900675.pdfIn PDF document text
    • http://spiritstudio.ru/rijakorazivowarubevk00k.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/7f8e7400.pdfIn PDF document text
    • http://imedo.ru/855322687056ta05.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/jokosufonem-dumem-pazas-nutujiwafe.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/sdfij3g/antihero_skateboard_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/eEEkhaL/true_story_football_movies_2019.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/8215c.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/2hijejb/speed_bump_car_crash_test_speed_breaker_challenges.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/Tjdiijj/5_seconds_of_summer_teeth_lyrics_espanol.pdfIn PDF document text
    • http://gidpopiteru.com/54698896260nofd0.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/jf1bcjd/princess_unicorn_running_gameplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dinuwulorixipe.epizy.com/scientific_method_activity_7th_grade.pdfIn PDF document text
    • http://dunixojojulif.epizy.com/bewoterifevizi.pdfIn PDF document text
    • http://jefokid.rf.gd/vexozosivadiwusiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 4896 bytes
SHA-256: 9251392133d57e3acf3ac1da6de8293e12fa3b61c6a9d1d5f24be58d8b4e03e8
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 9876 bytes
SHA-256: 83cda579b85708b4f168bc1a28b3032d2c0ddac3b20b116c5cd4ebf834c68564
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361