Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ce34f92e8bec5e…

MALICIOUS

PDF

69.2 KB Created: 2020-12-23 22:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 61dca49f0c49cbbb1d7de68795854bde SHA-1: 97418765d21d7851370e93969471b88bc7765d0a SHA-256: a5ce34f92e8bec5ef023393ec1eaef6ec9ac9c22e3c183413feda22e285259c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, forming a link farm, with one prominent URL pointing to a potentially malicious domain. The document body, though heavily obfuscated, suggests a lure related to 'Mortal Kombat'. The presence of numerous external links indicates an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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 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.
  • 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://trafficel.ru/strik?utm_term=mortal+kombat+jade+fatality PDF link annotation
    • https://cdn.sqhk.co/mapigusene/URzhi1K/79040930266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fa536b65cb00.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/jjERegh/downhill_mountain_bike_racing_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/dgijelN/suzuki_boulevard_c90_service_manual.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/vetuzaririlogav.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/9701581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_5fc10c6493527.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/187ef886-6b6a-4445-aecf-ed29251dfdce/name_generator_based_on_personality_traits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac351a15-7e0c-47cd-ab57-c8d2597d6b3b/21552658803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca51ad63-65f9-49fd-b0a4-59c3ef46d4fc/2107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd33728-8f74-4d4d-be28-78637bc72c60/tobojedivafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c32092-5989-4709-be15-186adbdee8ce/buwebagajisapevuzen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98249059-470b-4eb6-a3ec-5302813be59e/56145997983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb720089-0d0a-445b-bda9-f69ba3b71748/arrow_going_up_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82dc9930-8c35-4f36-b723-449f24a2c2ce/literature_a_portable_anthology_4th_edition_free_download.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_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 5264 bytes
SHA-256: 30d92ffd101a6ff620629820b824c0a653c0ccdf71dfda1a86c0b07e9ac1b301
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 13776 bytes
SHA-256: 373c3ffd997120c8913ba16a325baaa01dc739b73ea88a583d54f50cad7536bf

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