Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aff517a1a242a6e…

MALICIOUS

PDF

79.1 KB Created: 2021-02-28 05:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4a1c684e1075e9d5d7f849a9fb1ade6f SHA-1: 8ae6cebed8fa4329b3c8a348fbe755279b01b90f SHA-256: 6aff517a1a242a6e4982652eb1d0403d189ed6ca898ee2c1279ad2dfcd9cc9fc
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

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 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
  • 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://fokemale.ru/award?keyword=diary+of+a+wimpy+kid+dog+days+movie+review PDF link annotation
    • http://gejesixave.scienceontheweb.net/87011917469.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/jagh6Di/final_fantasy_record_keeper_sprites.pdfIn PDF document text
    • http://compte-cmbretagne.best/family_feud_theme_song_piano_sheet_musicyzkab.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/programa_de_estudios_2011_secundaria_matematicas_primer_grado.pdfIn PDF document text
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/2660612.pdfIn PDF document text
    • http://a-trvl.ru/crispr_guide_rna_design_software2pit8.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/ggRNwyj/planet_pilkey_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/giaic0G/football_coach_2_import_league_metadata.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/dutigowetiwatof.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/the_tax_collector_movie_cast.pdfIn PDF document text
    • https://xawoveramexu.weebly.com/uploads/1/3/4/0/134095940/dululepi.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/fkN4Akx/color_wheel_the_artist_s_view_catcher.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/92565753161.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/dQUhj1p/virgin_pulse_app_not_syncing_with_max_buzz.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/iJjfTjh/eventim_deep_purple_sofia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kelujisulajow.rf.gd/warhammer_skaven_army_book.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/63279107191.pdfIn PDF document text
    • http://vawekud.epizy.com/ahsoka_novel.pdfIn 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_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 5248 bytes
SHA-256: 2f1c1e95b42fbbf6edc6b9e9305ce19f7af2e6a2d20eb9436565a9f14984f517
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 10704 bytes
SHA-256: bdc52f110c5e331e8d45e9277b21c352c16e3936b504653d2445cda62a5e3777

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