Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3dcc872b5fb960…

MALICIOUS

PDF

93.0 KB Created: 2021-01-08 19:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 990151dc72d1436aaa17349d07625caf SHA-1: c0ce1df2b63a35c4f5b6e01f70a761b93aa506e1 SHA-256: 7a3dcc872b5fb9600dcd85b3ea1c5b3c557659148c9062b561a6e4655eb5c99c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=change+24cm+to+inches PDF link annotation
    • https://cdn.sqhk.co/zubuwebofe/jjhhGhj/10187771843.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/ifs2Tii/6547065253.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/lupasufevazetamu.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/Xhfjgmj/66465121961.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/8c573bc6-da5e-4b92-85bc-76a206b74d0b/51424138654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67447cad-c744-409b-8169-e6c5a6db9e3f/saroxaworobuwopagejatod.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/get_vehicle_owner_information_telangana.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/34670916500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4714aa70-4131-4fc2-a31a-11955db23df4/dynamons_1_kizi_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f24d2e-eb29-4be1-a6ab-e5536aaf930f/o_christ_the_healer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7860b2a-fd01-4e3d-9c49-abb8d782169d/street_fighter_4_android_full_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708229ea-fb85-4657-88d9-751cddb77ada/55881862579.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/assassin_s_creed_revelations_wiki_guide.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 26132 bytes
SHA-256: 041beba6faeca78ed3651a013a59d1dc0c4be2835dd8c0316b19fef609f4a177
font_01_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 5208 bytes
SHA-256: 6cfd0a8c7d454feb37726ed0f8ee3cc859c9a904fc7badae99db26693b6c873c
font_02_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 10640 bytes
SHA-256: f13ae4d9d38b5feddfa7f01b1a614b6c9841544683180a87f42385b96a24701b
font_03_sfnt_off00015137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15137 16284 bytes
SHA-256: e958ea77bbefdab7dcf92705078345218821b6632d2ed03d9a8c7ae93fd6e367

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