Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5bbe3bdb874903…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 22:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 92feec77c2e3097a184322069f03b42d SHA-1: 64228a001492c840f9035d5adde077acf41c5271 SHA-256: 4b5bbe3bdb874903724e7afd816c8ae365c8b763b5d40a54ed496ca2c736fcfa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://nipisod.ru/123?utm_term=roughneck+air-+operated+double+diaphragm+pump+manual, is likely part of this scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=roughneck+air-+operated+double+diaphragm+pump+manual PDF link annotation
    • https://cdn.sqhk.co/titubebojek/hcP84q0/run_android_apps_on_pc_browser.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jblrjjq/parental_control_app_blocker_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/ikjy6Cy/vigaxofufap.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/jjicjbd/vovaziropatinekowobuwerew.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/k2yghB0/running_fred_apk_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/hrjehbq/zombicide_night_of_the_living_dead.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/OiejjjL/dazitefuwolab.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/jhhjHgg/vitamin_b12_injection_dose.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/OKjgijr/buck_hill_ski_racing_team_calendar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tugumeb/50452772602.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_5f7c251200dc45dca5669138cb25ed1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3122d25-daf8-444f-8a42-f3527a5ea618/zugawelapobunozesepemopog.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_cc6a4556e1da43dc9111d1034d4ec28f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b478d2d-16f2-498a-9f2c-0a50d721cda5/leperoxozavonarokik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853604ec-7b6a-457b-a15d-6e2cd1c77760/ronuvofopaxufazunoraj.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/bovee_wma3000b_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/vixebanotuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d86a0a2-00dd-4581-9469-24dd5e801ead/30153963668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1081fbc5-af11-498f-a676-a11a4a97aecf/beginner_running_program_app.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_6b977bf555314574bb4c5af07d99d9a3.pdf?index=trueIn 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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 5552 bytes
SHA-256: bde9aece014a85055586487ff9d2cf7dc946a2a0048b762755051b7b00cf6436
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 10736 bytes
SHA-256: 53807aff5377435c9c372a7e6e25fa3d4752b2b2e1a5f9cd394f2bd6b32673fe

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