Malicious PDF — malware analysis report

Static analysis result for SHA-256 c989ba24c3052a5f…

MALICIOUS

PDF

91.3 KB Created: 2021-03-21 23:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e58fd8797bd599675ba323141d9374 SHA-1: e9f90357fb6d5fbeb6d54d7fef920ff8df4073f6 SHA-256: c989ba24c3052a5f2c0904869501c0ee816a6c025374fa6ef85aa7c28c851a9a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=logo+itil+v3+foundation+certification+cost
    • https://cdn-cms.f-static.net/uploads/4501503/normal_604a3e18c66d9.pdf
    • https://xujuladobagaju.weebly.com/uploads/1/3/1/4/131437733/watarodox.pdf
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/a44a931dbe781a.pdf
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/risapefejumalozevi.pdf
    • http://rujajabejeveto.66ghz.com/font_awesome_5._1_cheatsheet.pdf
    • https://xumusozopojuvuj.weebly.com/uploads/1/3/1/3/131398507/nitos-xepokafetu-zogabitalup-riwofamo.pdf
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/6700771.pdf
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff2c0b94b7ba.pdf
    • https://papazutizo.weebly.com/uploads/1/3/4/4/134467207/keruparefofuvi.pdf
    • https://tutiwelureno.weebly.com/uploads/1/3/4/7/134714557/f2969.pdf
    • https://static.s123-cdn-static.com/uploads/4384150/normal_60028b10ca4b9.pdf
    • https://kagamufoxigog.weebly.com/uploads/1/3/4/0/134013308/remox.pdf
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fd5f4e284fbf.pdf
    • https://cdn-cms.f-static.net/uploads/4385437/normal_60387f7f4b7aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lexawelezalum.epizy.com/95575747834.pdf
    • https://uploads.strikinglycdn.com/files/ddc15032-7690-46e3-a625-08be34747084/75540849112.pdf
    • http://vavijirodujozi.rf.gd/99080260834.pdf
    • https://uploads.strikinglycdn.com/files/cf0ff0f4-de12-4d94-8663-9104fd4b9bef/how_to_do_certified_mail_envelope.pdf
    • https://uploads.strikinglycdn.com/files/cf8df1e3-9b06-432f-92b2-135c0a46c05a/american_assassin_2_netflix_release_date.pdf
    • https://uploads.strikinglycdn.com/files/e17f5920-198e-41cd-87ad-885381be0ebc/91881032646.pdf
    • http://sapifux.epizy.com/taromedubuxitizusi.pdf
    • https://uploads.strikinglycdn.com/files/4a9f4460-a9fa-4548-97d5-ec9083396563/what_causes_tropical_climate.pdf
    • http://tujefozumuresul.epizy.com/kesler_science_escape_room_answers.pdf
    • http://lopijuxisox.rf.gd/handbook_of_algorithms_and_data_structures.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012479.bin
ba82063f796e26592287cd9344e5ef0967dce5c7114012c92fde641fc0ac7380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 5356 bytes
font_01_sfnt_off000136d0.bin
54ea3fee28d95d90b02603886b7aeb005f3c4cccc3f74fdeb96eeb6eea93fa02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 12012 bytes

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