Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e76713357442bba…

MALICIOUS

PDF

73.6 KB Created: 2020-12-21 07:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 90a31746952a872e856e1eaac208cadd SHA-1: 95c15f69042fceacca4ab497aef1007cce68521e SHA-256: 7e76713357442bba50ea839af984812ebd133e74deabfc2d65a04750476c8dc4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with several pointing to disposable hosting and potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/strik?utm_term=your+song+piano+chords PDF link annotation
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://bevalulage.weebly.com/uploads/1/3/4/9/134902231/govekokiwiwepiwewa.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/gazuf_daxatul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fb5b56a7331a.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/xixemufag.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/pasawexawinogad/free_customized_t_shirt_design_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5b184c-5125-4009-8c13-54031dba96ad/35556472292.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dfe77d0c8f249d40ab54/t/5fc16edd18e72e5fdb0da0b8/1606512350080/mepuwew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc538fa6b97992eb578077c/t/5fcef14c509e863c68241c5b/1607397709366/download_game_air_attack_hd_lite_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d8ff8a-9f8c-4ed9-a599-88ba917d3fa4/41158494263.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9da7ff99f865bfec24a0/t/5fdd25e5a664ca5ea72b7371/1608328679463/add_menu_button_to_action_bar_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 5264 bytes
SHA-256: e468f918872eb32ededefb926ba36cd4448b1c64f9bb236ad477dc8926761c05
font_01_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 10864 bytes
SHA-256: a66b43ec487ae4c0aabd4d8547f778f69323ad89178f79db66bff122646c985e
font_02_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16120 bytes
SHA-256: fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd

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