Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3748f24a4909a3a…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 02:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 76ab165fe472f5c87bd8eaf2df71952e SHA-1: b4d730d6f922a53b72a9ff74d04c7117a4826347 SHA-256: a3748f24a4909a3ae4e6ef71d0cc511de5de3de82d0a24069aeff0aeb70116d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, such as 'https://crophysi.ru/award?keyword=que+es+neumatica+y+hidraulica', likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9291

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crophysi.ru/award?keyword=que+es+neumatica+y+hidraulica PDF link annotation
    • http://fb-ig-copyright.com/dazalutifapinobunifizupo8vho6.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/Ux2jjgz/school_run_3d_endless_running_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fe5043abae28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fccbdd2553c6.pdfIn PDF document text
    • http://geekcods.com/avery_template_8163_for_mac_pages3ng2i.pdfIn PDF document text
    • http://clientesdkb.com/kino_mongol_heleer_shuud_uzeh_2017ki9z5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fcd0655e6d71.pdfIn PDF document text
    • http://momentshop.space/free_printable_hourly_planner_sheets3vwen.pdfIn PDF document text
    • http://lovechat24.club/cara_template_ppt_baguswnz8g.pdfIn PDF document text
    • https://cdn.sqhk.co/pivoledofag/eT0Qhjd/sewewuwitexewefilelezugug.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/request_for_leave_of_absence_form_sampleh4jrm.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/bijhcBZ/79744185190.pdfIn PDF document text
    • http://forpost-electrica.ru/6175385568302cud.pdfIn PDF document text
    • http://sunny-web.ru/crossfit_level_1_training_guide_arabicgwc1o.pdfIn PDF document text
    • http://winoraama.fun/absceso_perianal_tratamiento_antibiotico_de_eleccionfx13d.pdfIn PDF document text
    • http://kelijoninofi.22web.org/pilujibesupovitonubiki.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://duwufinojitu.rf.gd/33411606005.pdfIn 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5112 bytes
SHA-256: 42d340b6e3407d9dcc53f1d085f5761fbea9c18132e2e8652d3078a3a3328e9e
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 11580 bytes
SHA-256: 2ba281dcc122fb9dabfd20e58e259c7dc16c319bf0d2d6ba74b1e483b4ea9fd3
font_02_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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