Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bffaf238e69b115…

MALICIOUS

PDF

126.7 KB Created: 2021-03-01 01:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fd080c60c8a378251a79794c12a9c5ae SHA-1: 5b39a4ba132fee1b9a17f92b570e7c73ea4ff9f1 SHA-256: 2bffaf238e69b115f0d593fd290566bbb0a602271209852d17664ed7f1a29caa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=how+old+is+link+loz PDF link annotation
    • http://baby-slings.ru/drumstick_recipe_barbecueez8b9.pdfIn PDF document text
    • http://uablog.website/is_red_bull_healthier_than_monster1dnfe.pdfIn PDF document text
    • https://cdn.sqhk.co/xazewizol/o7iidrS/race_car_climb_apk_mod.pdfIn PDF document text
    • http://urologo.store/how_to_treat_a_hypo_in_diabetes9krfj.pdfIn PDF document text
    • http://useporte.xyz/pebble_watch_app_2020ndg3z.pdfIn PDF document text
    • http://trylait.pro/65336691752d2586.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/UACjghb/64499876737.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/j9Djac1/51932229824.pdfIn PDF document text
    • http://goossyy.online/blood_test_report_for_pneumoniafrsp1.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/hfibjj5/59166991077.pdfIn PDF document text
    • https://cdn.sqhk.co/mupijuwo/iao7qjh/vowagavaz.pdfIn PDF document text
    • http://iglivesupportteam.com/how_to_tell_which_atom_has_the_largest_atomic_radiusquvwx.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/c6hcgcd/lunuwekirunubejolo.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/uhfgUif/osm_scoutlijst_2020_middenvelders.pdfIn PDF document text
    • http://begemot.space/sisupamuferevatunefokekuv3fl6l.pdfIn PDF document text
    • http://goossyy.online/wobaph2qxj.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/nokiva/kizanali.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/94389202526.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/35603461540.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/bluestacks_mac_os_x.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/lamborghini_song_free_pagalworld.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D98 3272 bytes
SHA-256: 0dea1f8a9786e8278098801f34eeeb24fbcfaeda0d4745c705895adcb16285ca
font_01_sfnt_off0001a95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A95E 4272 bytes
SHA-256: 414b183e1efa67a1137fbd79c81570faf8adae515060e726e3a86f7d4f4c8c4f
font_02_sfnt_off0001b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E8 11516 bytes
SHA-256: ba527027532edb1fe4ab0b93892ffeb42c4cc35fedff7f7151a5f9adaea7a39f
font_03_sfnt_off0001debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEBD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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