Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b9678e5a816050…

MALICIOUS

PDF

73.5 KB Created: 2021-02-01 09:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bd3be8e76fc369fbd3c573917c1b63a3 SHA-1: 95e77f3d7fe105fd6663502e91d3a243af282a94 SHA-256: c6b9678e5a81605070a564d777bd4f33397d616bd53f33b67b2ea4cb13c523f2
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=fitbit+alta+size+guide PDF link annotation
    • http://com-copyrighit.com/389615518800j1a1.pdfIn PDF document text
    • http://netlysy.online/zusutezeluxobovifog07gyn.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/n3giqha/change_eye_color_app_for_pc.pdfIn PDF document text
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/8851d05f1bc4.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/f20c848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ffcfbef1e0d0.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/9gf9jiV/mefunis.pdfIn PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/vurezikawug_roponovaduraj_wadominu_wazare.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/jiejjL9/jugomin.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/vWigEge/jofasi.pdfIn PDF document text
    • http://acgmgroup.ru/kotusokuxuvnaust.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/kiwopusafize/fundamentals_of_english_grammar_teacher_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/former_australian_test_cricket_captains.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/beethoven_fur_elise_easy_piano_sheet_music.pdfIn PDF document text
    • http://selosaxugi.epizy.com/joziga.pdfIn PDF document text
    • http://bubewap.rf.gd/censor_board_copy_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/android_go_rom_for_moto_g_falcon.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/48259483768.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 5040 bytes
SHA-256: 37a9e32cfe074f4d764647e7b09ba309b61c8051148df68366382fdbf3c63a63
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10968 bytes
SHA-256: 7a89b0a2a835e28a587f1d1dabfef9534ee70d2ce9ff7b9e27b3edf05bc7f88b

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