Malicious PDF — malware analysis report

Static analysis result for SHA-256 26223d19fc7b41c0…

MALICIOUS

PDF

70.6 KB Created: 2021-06-09 22:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 403f8969844540654fb091a240bccf2c SHA-1: 03ed3f5194768bf9f07c465fd9273cf275c771ea SHA-256: 26223d19fc7b41c0d013bae411acb4e16a774b029f6cd26efe72f7a844256211
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('allytemp.ru') and another to a Weebly hosted PDF, indicating a potential link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/pbw?utm_term=bekhayali+sad+version PDF link annotation
    • https://jikunuxot.weebly.com/uploads/1/3/4/3/134315974/4735937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393209/normal_60017695527ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_6017a45ec88c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_60bd956aa07ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_60bc0b4d585a8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4452385/normal_60b2eae48b781.pdfIn PDF document text
    • https://duduzigofusu.weebly.com/uploads/1/3/2/8/132815892/321c09d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_6007cdbc512e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_601e267fa7e5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5ff813423d2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_604330ac62397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzimotum.pbworks.com/f/post_office_exam_study_material.pdfIn PDF document text
    • http://lilofebuful.pbworks.com/f/zizewisasuxulaxalijito.pdfIn PDF document text
    • http://gawalutibig.pbworks.com/f/the_sims_mobile_mod_apk_ios_2020.pdfIn PDF document text
    • http://bijopozo.pbworks.com/f/cj7_full_movie_english_subtitles.pdfIn PDF document text
    • http://tovemubu.pbworks.com/w/file/fetch/144586491/powamexifabaxogoravadobul.pdfIn PDF document text
    • http://wurogakitibe.pbworks.com/f/funevivesusitesimaxok.pdfIn PDF document text
    • http://koruzepuza.pbworks.com/w/file/fetch/144802962/free_guided_meditation_for_sleep_10_minutes.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/go_math_lesson_5.4_answers_5th_grade.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144650604/vexurukomimawikizo.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144419589/water_bottle_flip_challenge_baby.pdfIn PDF document text
    • http://ximusutoj.pbworks.com/f/ample_sound_-_ample_guitar_m_iii_3.1.0.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144575013/jatelojojokorosodozof.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_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 5188 bytes
SHA-256: c120133e99f3856ae9f7d11d7d41c6ad522c2a2abc86af5ecb5a9fd9013bddb0
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10412 bytes
SHA-256: 979b1838b75cb62ca97f223d8ce82f8f6fb34b2749391209768c90fc8a295265