Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a417e6ac094311a…

MALICIOUS

PDF

72.0 KB Created: 2021-01-01 20:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b111bb6a2b8430aa9137e944a61d95a0 SHA-1: c70844adbf67a9a5d33ec6a101bca4e8c857ce9b SHA-256: 7a417e6ac094311a23e89a3e9b29c016a7d4230aad28cb193f40aef72e6fd3dc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF link farm' by heuristics. Several of these links point to Weebly-hosted PDF files, suggesting an attempt to distribute or mask malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=localhost%252Fphpinfo.php+not+working
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/9503044.pdf
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/benexiwewes_rikabekovifu.pdf
    • https://wumemoxononaw.weebly.com/uploads/1/3/4/2/134235532/wevafanelaroxi.pdf
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/2763fd6191e953.pdf
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/3547309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xanebavifamopez/tiwukegixoxebofitij.pdf
    • https://s3.amazonaws.com/vikukinumet/xewuxilaxive.pdf
    • https://s3.amazonaws.com/towutoginadivu/xingamentos_mais_formais.pdf
    • https://s3.amazonaws.com/kofabube/dominance_personality_test.pdf
    • https://uploads.strikinglycdn.com/files/f04ac002-858a-4b8b-a3b3-c206db43189f/vehicle_document_alert_notice_scam.pdf
    • https://uploads.strikinglycdn.com/files/2bdb3134-e054-446e-baa7-8b0ef94e1917/linear_pair_geometry_examples.pdf
    • https://uploads.strikinglycdn.com/files/8220f9ca-2b2a-4a68-803b-85024f07774d/screen_recorder_apk_root_required.pdf
    • https://s3.amazonaws.com/tetenifeme/wovizalodexedijami.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/44496250956.pdf
    • https://uploads.strikinglycdn.com/files/8f1b1622-6139-4bfb-a159-e6075a42c4e8/atlantic_tire_distributors_login.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4e.bin
c0c9d15bfc49a2edea65fae271f6712cddbd1c9617c79ec2e7f0a6e5835cce45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 5112 bytes
font_01_sfnt_off0000deb8.bin
450cb7aec6b339f8322e9ab8da95e2b3382c1d2d1080600cc991351cea6d6017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 11376 bytes
font_02_sfnt_off0001054b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 4324 bytes

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