Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc03778c0b9bf3ad…

MALICIOUS

PDF

70.5 KB Created: 2021-03-15 16:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 70bd9b74c127b63fd96600de96e584c0 SHA-1: 2db261f7c26a9dd61349c8db78abbcda11813c80 SHA-256: fc03778c0b9bf3ad111bbf1db770a89af8e6b052baf2dae2cb80165e692c04d5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'signing naturally 8.1 answers' and application metadata, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=signing+naturally+8.1+answers PDF link annotation
    • http://linza.media/la_celestina_resumen_por_actos_y_escenasgufb1.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/nejubemovuzin-jirenevage-mawesefafaf.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/7b008b33c561a.pdfIn PDF document text
    • https://gigewobejej.weebly.com/uploads/1/3/4/6/134638222/ravebuwewofumejo.pdfIn PDF document text
    • http://skameyki.club/problemas_de_las_leyes_de_newton1jxd4.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/jqghfgQ/amazon_music_hd_or_unlimited.pdfIn PDF document text
    • http://ru-1.casa/p90x_workout_free_onlinekqz26.pdfIn PDF document text
    • http://select-get.top/982964946wl8fa.pdfIn PDF document text
    • http://zhigina.ru/simple_comfort_thermostat_troubleshootingml3f9.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/jejbkij/busemun.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/0d146a70ad.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/nesewizuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/giibhih/98763868105.pdfIn PDF document text
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/cce1a678d82a.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fOyific/cowboy_game_stats.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/lexomusomitesilemuf.pdfIn PDF document text
    • https://kuxevirajopar.weebly.com/uploads/1/3/5/9/135990570/fujivalikativu.pdfIn PDF document text
    • https://cdn.sqhk.co/bapinero/hj2gemx/xegekikufutojejawuk.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/ijhcfjb/international_superstar_soccer_game_download.pdfIn PDF document text
    • https://fapirezomamu.weebly.com/uploads/1/3/4/3/134382700/masibiwut.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/liropiko.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/7206338.pdfIn PDF document text
    • http://bytlly.com/18vcafIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 5428 bytes
SHA-256: a602d0e2dd1d6dd3e4be11bd2ca32cc959b48d74336c7e30091e3ebca55b7d82
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 11076 bytes
SHA-256: 96a2b4e6a1b520d5c9e1e47e568406fc332b2c380974dd5486d552b65cec54d9