Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ff51aa19a38e7…

MALICIOUS

PDF

75.5 KB Created: 2021-01-19 05:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01281d9b2acfaa445780f87f26c0ebd1 SHA-1: 6e9f6f8b942fb8f99a059c330871672264ecb9c4 SHA-256: c56ff51aa19a38e7d518bbd4da6f1054296977b8640df48bd47ce0e22ecb575d
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 embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to obscure the final destination and potentially distribute malware or phish for credentials.

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://trafffi.ru/wb?keyword=death%20coming%20game%20free PDF link annotation
    • https://cdn.sqhk.co/nonuripot/dibAijO/50253489022.pdfIn PDF document text
    • https://site-1173285.mozfiles.com/files/1173285/riders_on_the_storm_movie_2020_trailer.pdfIn PDF document text
    • https://site-1178504.mozfiles.com/files/1178504/90614106040.pdfIn PDF document text
    • https://site-1247202.mozfiles.com/files/1247202/88188482586.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/Tjbaiaw/stick_war_2_order_empire_hacked.pdfIn PDF document text
    • https://site-1223295.mozfiles.com/files/1223295/minecraft_2009_download_free_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/momajuxu/RRWF0gS/application_vitmat_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vovidonob/dgjx3je/57321539036.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/hbUIhhm/crazy_cee_lo_green_guitar_chords.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5feb0001e6dd0.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/juxatop/windows_7_ultimate_32_bit_free.pdfIn PDF document text
    • http://jinibodakix.epizy.com/used_car_appraisal_form_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/mitosis_and_cell_cycle_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/easy_yoga_poses.pdfIn PDF document text
    • http://tirinito.epizy.com/calendar_template_google_slides.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/ruraritinedopene.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/21698557605.pdfIn PDF document text
    • http://bibobega.epizy.com/digital_marketing_plan_template_free.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 5084 bytes
SHA-256: d58c469184e9a9b9952bea32e4826e3802310d182d426b7068c118342b4de956
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10292 bytes
SHA-256: 708b18c999905eeb3b975c5d49a55edd7f121518e978b4361e8a909d64702311

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