Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3f98c494248c9d…

MALICIOUS

PDF

86.7 KB Created: 2021-01-26 06:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d9ad7fec8fa16a62a55a2e2584808b0f SHA-1: 8c92b55f3691db9c277ed3b736d21e002702adbd SHA-256: fc3f98c494248c9d520302fd1e9ccebea89f429585f28b0ab01f61e694167ee4
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it is a link farm on disposable hosting. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct textual lure is discernible.

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://trafftec.ru/123?utm_term=the+furniture+house+new+market+tn PDF link annotation
    • http://vizezokope.iblogger.org/tax_residency_certificate_format_france.pdfIn PDF document text
    • http://xesesevatep.22web.org/android_google_sign_in_failed.pdfIn PDF document text
    • http://magic-world.site/24780303888fmz8x.pdfIn PDF document text
    • http://hookup673.site/55120299560cbx2o.pdfIn PDF document text
    • http://iranomics.com/nature_sound_message_tone_download8k8x6.pdfIn PDF document text
    • http://raicen.com/ledizufexesu2vcvi.pdfIn PDF document text
    • http://sajitalunaded.22web.org/horse_head_craft_template.pdfIn PDF document text
    • http://pl50off.info/67566499331iae30.pdfIn PDF document text
    • http://unosital.space/app_to_screen_record_apple_musicjwa5j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagineju.epizy.com/74184040870.pdfIn PDF document text
    • http://sejojoxo.epizy.com/mituvumufuzamowuda.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/emulator_ps2_android_pcsx2.pdfIn PDF document text
    • http://lemijafuw.epizy.com/dofimopimepanawo.pdfIn PDF document text
    • http://jonegukum.epizy.com/lirasejibapekex.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_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 5080 bytes
SHA-256: 2057ddd6e954cd28d773bd6c3b77f170c491719f4edb0b51cb9dab3418a14bbb
font_01_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 11180 bytes
SHA-256: 52528739b3c51550643510be8a4cbfc8afd7d409de91ac15772f1bd61e3930d7

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