Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22a23164b2113e6…

MALICIOUS

PDF

63.0 KB Created: 2021-03-22 10:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 34ce6b072fc41c980b0a4a1f1e544f8f SHA-1: 41aa62ad2d9ad83d7c8712fa4038558060bfdd8a SHA-256: c22a23164b2113e62b3e67e0ec10d5972cb25ed723c383ce1fabdf81c83027cd
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. One prominent URL, 'https://golowaki.ru/strik?utm_term=how+do+i+change+the+subject+line+in+gmail+when+forwarding', appears to be a lure disguised as a search result. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

Heuristics 4

  • 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
  • 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://golowaki.ru/strik?utm_term=how+do+i+change+the+subject+line+in+gmail+when+forwarding PDF link annotation
    • http://megalit-korolev.ru/pudawozetufipunejul0qdf3.pdfIn PDF document text
    • http://xitnet.fun/losedegisopitumelotibvfmfj.pdfIn PDF document text
    • http://custits.space/caryl_churchill_far_awayr2335.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/mutevamadewatovizolubufe7v6e1.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/specialized_speedzone_1_cycling_computer_manual.pdfIn PDF document text
    • http://ig-copyrightnotice.com/comment_fusionner_plusieur_fichiertxhps.pdfIn PDF document text
    • http://clyb-wylcan3.space/lawn_boy_10323_for_saleqnep8.pdfIn PDF document text
    • http://capridigi.com/hampton_bay_ceiling_fan_remote_uc7078t_not_workinggd8ng.pdfIn PDF document text
    • http://getliterate.online/boxuvusaxaxabeab8qb.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/986217320.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/aaac6610-f9ac-43bd-8740-e7080886c1d7/83490993264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbf7f20-1e6d-4bd7-afc0-802d54b30cca/vomabiseroxevotezose.pdfIn PDF document text
    • http://kepukedixoda.rf.gd/wilefobixotala.pdfIn PDF document text
    • http://tujupifirafadus.myartsonline.com/kinitizebikijojaxufovana.pdfIn PDF document text
    • http://jonatabofozepov.epizy.com/96137252846.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/types_of_functions_maths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec421f07-0988-4209-9403-332541e90f7c/jisade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49844c5b-f4b2-4225-8748-c3ce7a955e31/torulojop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764e013b-57e4-4f71-a010-750391c61458/how_to_clean_filter_on_dyson_ball_multi_floor_2.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5704 bytes
SHA-256: 9216c894fd8f8f68577d73a9dc2e4bf13851d6f159ed3dad881c6a9897e1b361