Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1a1a835d56b610…

MALICIOUS

PDF

75.7 KB Created: 2021-05-11 07:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 97bcc9969dc994d95a5bf25c11a02ff9 SHA-1: 5fe215ed341a5fe3c195ca25a84496f8c885a540 SHA-256: da1a1a835d56b610770d351d038b7a1205a60b77964e0700fe909673031e06cf
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, with the primary one being https://jacksth.ru/strik. The PDF's structure and the presence of many distinct hosts suggest it functions as a link farm, likely intended to redirect users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=ingenuity+rocker+weight+limit PDF link annotation
    • https://cdn.sqhk.co/fusaduxuw/aeicaJm/xutadolawarekojuvizajul.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/gevepuvene-wifis-ludezesexi-sogurosawes.pdfIn PDF document text
    • https://cdn.sqhk.co/ranilabar/eexRNgi/jurassic_world_the_game_cheats_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/jiOhhTp/smartthings_plug_firmware_update.pdfIn PDF document text
    • http://tujidal.mypressonline.com/temisal.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/ec72e6c.pdfIn PDF document text
    • https://cdn.sqhk.co/sisowufabo/gmo39bz/smoothie_maker_game_online.pdfIn PDF document text
    • https://xiwigelu.weebly.com/uploads/1/3/4/6/134644840/diwewinipa_wujebida.pdfIn PDF document text
    • https://cdn.sqhk.co/jobalafefi/ifgia0b/31019220645.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/bitukixes-xajofim-muzafefasagusag-juxev.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/p6ig6ig/maths_teacher_s_guide_grade_8_platinum.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/sapagixoxolukode.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/enterprise_beginner_teacher_s_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_fe0b2334930c4dec892d06543e882811.pdf?index=trueIn PDF document text
    • http://zasuwunal.myartsonline.com/bowotax.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_05719904531b40b4aa981196028ed762.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejexe/the_shack_full_movie_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/funiwuturi.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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5020 bytes
SHA-256: 05591a4b95cf4a5a589b88ad6bba12cc312897b9b89e1136a58c7da2b4c0d0ba
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 11528 bytes
SHA-256: 56624aaa6f19392e52d9643eedacbf66d38356964a1d8c60eb7b3d0d3169ad14

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