Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c57940ce198765…

MALICIOUS

PDF

70.2 KB Created: 2021-02-12 11:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c2f100ae8eb8be3136677e6a30ca9bd6 SHA-1: 2052946bfe9687429ce4489df2555b30df875545 SHA-256: 42c57940ce198765343a4f9ef63928d0bfb25b48292f7ddd6891d2bfba942914
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://baarspo.ru/wix?keyword=m16a4+airsoft+gun PDF link annotation
    • http://sexedate69.site/863850805742shz3.pdfIn PDF document text
    • https://lewixukulir.weebly.com/uploads/1/3/1/6/131606807/1813638.pdfIn PDF document text
    • http://chatik85939775.fun/88087572419dj89s.pdfIn PDF document text
    • http://kprovk.xyz/xofavosofepajojanutemzsxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5fca85a759c06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_6009072525bcb.pdfIn PDF document text
    • http://leadtop.co/citra_3ds_roms_pokemon_xtiaq7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fe77cbf13bf3.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/jKGggjP/268602011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410953/normal_60025d535911f.pdfIn PDF document text
    • http://pupijepu.22web.org/picsart_new_version_mod.pdfIn PDF document text
    • http://am-sound.ru/freemasonry_morals_and_dogmasanhe.pdfIn PDF document text
    • http://fitokapss.xyz/sewing_bag_template8z141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://luselobek.epizy.com/lomosinixetojokelaf.pdfIn PDF document text
    • http://rimamosapike.epizy.com/georgia_mandated_reporter_phone_number.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/kanowavos.pdfIn PDF document text
    • http://xajebanexored.epizy.com/curriculum_vitae_english_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 4968 bytes
SHA-256: cf65654392824e96bf34de2b626afbb724cf1afebec5bd8c88a386a3d85990a8
font_01_sfnt_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 10368 bytes
SHA-256: 0aa7578c6d801eacdf28471fc8157abb13e992c72b1beec1c9c4ac37018a920d
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333