Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ec2cde1e6deb3…

MALICIOUS

PDF

73.2 KB Created: 2021-03-01 02:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 012b3a6b5d08395cb80eb070167416d8 SHA-1: 8c5bfa735e95770981686a836afafbe62244769a SHA-256: b72ec2cde1e6deb328f419623900181fa9acbab50caf1285efa30c47dfe56ea9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to 'Polaris office apk para pc', aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=polaris+office+apk+para+pc PDF link annotation
    • http://wumomotetidofe.getenjoyment.net/91331438299.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/SsUU6vV/vmware_briefing_center_munchen.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/baptised_in_the_holy_spirit_and_fire.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/aiejadd/mixowutus.pdfIn PDF document text
    • http://redita.fun/bodie_kane_and_marcus_investments_te8247k.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ghaqyhg/tonugugifodi.pdfIn PDF document text
    • http://folejaf.mypressonline.com/phases_of_the_moon_identification_worksheet.pdfIn PDF document text
    • http://smm-target.ru/845699578264yqx2.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/d5shxZx/5289442778.pdfIn PDF document text
    • http://vivadoctor.ru/11819652870zkgp2.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/jghiifH/409874756.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/1998_toyota_corolla_stereo_wiring_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzuxujov.epizy.com/bunco_game_sheets.pdfIn PDF document text
    • http://zajunevoza.epizy.com/is_456_amendment_2016.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/limupipetazokubaso.pdfIn PDF document text
    • http://nofegogimulat.rf.gd/luna_eft_programmer_s_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5076 bytes
SHA-256: 1a1c2fa995fb54022c55f2c53f5581ec3bc9069ed3d2631e298b0ba37e199e48
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 10228 bytes
SHA-256: 5580c6813963ad2c0d2946178a535042befcca32601ca01e89f4f6ea3cdc27ba

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