Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ceeb508dfaa1fd…

MALICIOUS

PDF

84.6 KB Created: 2021-04-12 18:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38ece82958393138372e61ebbfb414ec SHA-1: 21d494323ec54fbfd5c95bcc2135c52caa0ac355 SHA-256: a7ceeb508dfaa1fd3938baf7504f5d663d34ee2bc84269273366cda24c4298cc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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/strik?utm_term=don%2527t+rest+your+head+character+sheet PDF link annotation
    • https://cdn.sqhk.co/zegetaru/ickYKM8/100_photo_collage_maker_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/iciesgh/41226611467.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hoGhhhh/regency_tower_colorado_springs.pdfIn PDF document text
    • http://bizamiba.22web.org/munchkin_2_card_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/6ghjhN1/fruits_basket_2020_episode_1.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/icIhj7F/roxajek.pdfIn PDF document text
    • http://pexukakadom.22web.org/archicad_12_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/Rjjds0C/66961206303.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/hggEmhg/34236885006.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/80957157568.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/wgh1bEN/boredumipulijuraxexepok.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/hdveaLK/living_a_boy_s_adventure_tale_chords.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
    • https://s3.amazonaws.com/rekorewexidiwo/comparing_broadsheet_and_tabloid_newspapers.pdfIn PDF document text
    • http://xasezujagabef.epizy.com/zusutanumafetega.pdfIn PDF document text
    • http://xodijofo.epizy.com/bv_rao_world_history_download.pdfIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_d87d8ae247094e29ac384963d6502eeb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/gardening_merit_badge_pamphlet.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_9bb79fec3d0745c48307cb684635d1d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/pisamagigopuzusotu.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/bhagavad_gita_in_telugu_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 4964 bytes
SHA-256: c1e2d2d60ff750aa8dc8ea6605904ac177664ba7df2880a97795513c067bc989
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 10828 bytes
SHA-256: 0599a5f26b5b540e2bcc5906d29dc4ef161a6b98dfdeb371eb7be931dab014d3
font_02_sfnt_off000136e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2