Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2f3eceeb6d548c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-29 18:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15d73844e617a895806987b517d1d8c2 SHA-1: 7fffe820d0241f125422afe5634cc20958323ca6 SHA-256: bf2f3eceeb6d548cebabb2e816f9e3b4676f9cf2a8ea5940a6ba5ba8ef44d4de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to zajinet.ru, likely serving as a lure. The document body, though heavily obfuscated, contains text related to 'cortisone shot' and 'gout', suggesting a phishing pretext. No scripts were extracted, but the presence of multiple external links indicates a phishing attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=can+a+cortisone+shot+help+gout PDF link annotation
    • https://cdn.sqhk.co/xugikokazo/hhjKibW/70118742456.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/7Gdjcje/billiards_game_free_download_for_pc.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/zaxoruwuxenozunedatovawem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_60066ae052c33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366952/normal_6000dc6fe2539.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/jaTqgfa/85512705965.pdfIn PDF document text
    • http://gatorama.space/how_to_become_chick_fil_a_franchise4066h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_602e41f07955b.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/gfkcLe9/53428207425.pdfIn PDF document text
    • http://poradoit2.site/pemerutizabnder0.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/djcf7KW/island_defense_warcraft_3_reforged.pdfIn PDF document text
    • http://berefiruzo.mygamesonline.org/aiag_msa_manual_latest_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_60537143c514b.pdfIn PDF document text
    • http://foodguideblog.com/most_common_genetic_disorders_in_humans8hh1d.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://fortuneo-enligne.com/16187021980jxjs2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujadexofon.atwebpages.com/xalujako.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/lojisejebela.pdfIn PDF document text
    • http://vokenijor.rf.gd/aptis_demo_test.pdfIn PDF document text
    • http://kotafonapajawut.epizy.com/if_function_in_excel_2020.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/maria_sharapova_biography.pdfIn PDF document text
    • http://nariwexupeg.epizy.com/outlook_2020_calendar_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/3087075873.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5100 bytes
SHA-256: 5cc6f5cd64eabadd112a840b5faefe9f44ffe1a1211ceb003f4923c4ee507372
font_01_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 10252 bytes
SHA-256: 45ceded8ffd99eaa0be19106bea3898eaf97d20986df3f9b9ba61060cfb7643d

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