Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c8cd1f07b4897e…

MALICIOUS

PDF

51.2 KB Created: 2021-04-05 02:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c731925e6fe50ec2fd0cef4de225f9b1 SHA-1: 5b647344ab07c3325c6bb2df53fb2fddabe6f747 SHA-256: 06c8cd1f07b4897e7e4179355905bd4d48038ddc127d5c2bbeaa0675520f49e1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous external links to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated, but the presence of external URIs and the PDF structure strongly suggest it's designed to redirect users to attacker-controlled sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9372

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 51 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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/aws?utm_term=homeless+bird+book+pdf
    • http://raisinsapp.pro/973951534322f09x.pdf
    • http://rankingcoach-seo.com/jogar_transformers_autobot_stronghold_hackedppxpt.pdf
    • http://rubisteq.online/what_is_artificial_intelligence_system5936d.pdf
    • http://maykistore.ru/pact_of_the_tome_warlock_buildj9rx8.pdf
    • https://bakuzasopawej.weebly.com/uploads/1/3/1/4/131408369/sobozusujepuvi.pdf
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/600fe5c9.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/b9897a81477f.pdf
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/wisajojikukuwuv.pdf
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/sizexizalexuje.pdf
    • http://fimugunidaditu.iblogger.org/ikea_dubai_catalogue_2019.pdf
    • https://remepapud.weebly.com/uploads/1/3/4/7/134767963/75b18852f50028.pdf
    • https://gegawega.weebly.com/uploads/1/3/0/7/130739786/nomizikuretelonog.pdf
    • http://sosiwuro.iblogger.org/21027305363.pdf
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_9c40a93e994a4881b74fb93294191c61.pdf?index=true
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_e329f559bd9a417bbbd625bcdc7805ee.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_440eca0c01c943f6a5c48c8af66a266e.pdf?index=true
    • http://bomepexajusopa.epizy.com/free_google_chrome_browser_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/89498360-71cc-492d-84ea-6183a77851c8/xibodedekamewojewepiwugiv.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_e2db781465644056ba6fa3ad59235d8c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44e2ae10-d07d-40b6-b9ab-a32019175552/nufafagupatived.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_10dd0490c17745309fbebc713386a23d.pdf?index=true

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