Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2793f452b5e4e24…

MALICIOUS

PDF

99.3 KB Created: 2021-04-03 09:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d67d8996408fc66f97918dacad404f33 SHA-1: 56d5faa6cfc88cac41994c91da3580204b5ca83f SHA-256: a2793f452b5e4e24bc57710a68cefaef437ae026c2006272dc2313ad23da6066
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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 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://seumenha.ru/award?keyword=x%25C3%25B3a+trang+file+pdf+online PDF link annotation
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/3438589.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/niduxi.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/majuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/gjiiugf/88978368930.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/3720976.pdfIn PDF document text
    • https://taxupolejunak.weebly.com/uploads/1/3/4/6/134663048/120418.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/giFgcxF/fibesenubimifikogogaxaka.pdfIn PDF document text
    • http://good-production9.site/63596033856c7xmt.pdfIn PDF document text
    • http://good-production16.site/aiag_cqi-20t7oc4.pdfIn PDF document text
    • http://tvoyoproc.fun/detention_android_gameplaymtmx0.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/cgehbcG/origami_flower_tutorials.pdfIn PDF document text
    • https://vakofariz.weebly.com/uploads/1/3/1/4/131438137/7301549.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/7d53ccfd6213e9a.pdfIn PDF document text
    • http://copyright-central-media.com/powerpoint_animated_icons_freeyk1m3.pdfIn PDF document text
    • https://ludodufapagita.weebly.com/uploads/1/3/4/6/134616483/jinegupatiravilipun.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hgOJTje/gepusavoxudorajeridok.pdfIn PDF document text
    • http://physcoo.com/plan_y_programas_de_estudio_2011_primaria_sexto_gradojlz6l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipaxunuvevi.epizy.com/74180735111.pdfIn PDF document text
    • http://vovijez.epizy.com/50442179547.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/read_big_nate_lives_it_up_online_free.pdfIn PDF document text
    • http://wulitebajanuba.rf.gd/bivariate_uniform_random_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/photoshop_cs5_crack_file.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/bird_song_notification_sound.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 5144 bytes
SHA-256: e5eb0f2bad2944774f2b4afdcf74f68a030d73ad2b5ba5313e9535b5ebd89cb6
font_01_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 14272 bytes
SHA-256: e1d4245a7c764af0d013876921972ccb1d225bada35231491edc044a0f817a5c
font_02_sfnt_off0001674e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674E 16368 bytes
SHA-256: 5b51767f98f71c217cc2434bdb61520f41c0b33f1c1d6813b87558f0cf7fcca2