Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad72d1fe571cc7a…

MALICIOUS

PDF

88.1 KB Created: 2021-03-22 06:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27c507dd887fcde169c8df642ea0066c SHA-1: 7f448e1567c49ad7a79269505f4b94744249b2f8 SHA-256: cad72d1fe571cc7af26af46e86649a0daf510b8f3415fbe3b4b35bcb0e9b894b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=2.3+logic+puzzle+answers+geometry
    • http://zabolojisag.getenjoyment.net/what_is_the_correct_tire_pressure_for_a_jeep_grand_cherokee.pdf
    • http://rofuxipof.mywebcommunity.org/bonofijugeriwa.pdf
    • http://virnet77.ru/35614379275nl2yc.pdf
    • http://just-gopro.com/warriors_manga_in_order75eu7.pdf
    • http://ogranifruit.space/xumisineluy9ym.pdf
    • https://tarosukawumoteb.weebly.com/uploads/1/3/4/6/134691059/82e59bbb4e6c41b.pdf
    • http://hristogrigorov.com/demisodababasabnyfue.pdf
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/b3e9bbd8d4db2.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/how_can_u_tell_if_a_rabbit_is_happy.pdf
    • http://bitiwiz.medianewsonline.com/99572551589.pdf
    • http://pifanaliriwabo.mygamesonline.org/68727120612.pdf
    • http://ledy66.net/4_pics_1_word_finger_pointing_answerbp4do.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ceb2b2b2-63c9-4481-bc2a-fc0ee6605ef7/krups_egg_cooker_measuring_cup.pdf
    • https://uploads.strikinglycdn.com/files/4f5ad7ad-1a22-4c1a-a4c1-bbb46ec2e779/jototodaduwiwone.pdf
    • http://nabulegewuwal.myartsonline.com/mazoraxuxedefepalelemaba.pdf
    • https://uploads.strikinglycdn.com/files/c9e85ee4-ee0f-4f0d-8947-6eed6d092580/69897277448.pdf
    • https://uploads.strikinglycdn.com/files/c2df5766-7203-486d-b9a3-c56737175b02/219012782.pdf
    • https://uploads.strikinglycdn.com/files/f20abbfd-4e27-4b15-9934-355f44717535/registered_mail_tracking_usps.pdf
    • http://jezevenakos.myartsonline.com/tujosujibanib.pdf
    • https://uploads.strikinglycdn.com/files/60040966-e648-4e10-97f4-849b3426bf5d/what_is_sequential_text_structure.pdf
    • https://uploads.strikinglycdn.com/files/a30aee8d-2b19-4d06-a27b-28124b4439d8/putobewupe.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_off00011928.bin
51e5f761edbcb98804acc26793968489e59f677bdc67966570f57c096aa4a5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 5728 bytes
font_01_sfnt_off00012cbe.bin
bc7c7136d96e62ed0b9c5e6f1f61c80fd2d63e52d63b023ec3e8601dc8ed17fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 11352 bytes

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