Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9f2aaeb846fcd8…

MALICIOUS

PDF

71.8 KB Created: 2021-04-05 03:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cfa23ee28fb857a7d8ab0e7bb2d071a6 SHA-1: e2468f09d814ecfec367d73423e60d1de2c7076e SHA-256: 3e9f2aaeb846fcd85db9eb2a530834e48a5abe115b420afc5d34d81624e935d8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/award?keyword=save+base64+pdf+to+file+php PDF link annotation
    • http://tadowuko.22web.org/quail_farming_business_plan.pdfIn PDF document text
    • http://megatorg.ru/mn_permit_test_scheduling9swmy.pdfIn PDF document text
    • https://cdn.sqhk.co/nafolekuge/h7jhhja/74557835612.pdfIn PDF document text
    • http://fortuneocredit.com/toyota_prius_2010_zvw30_service_repair_manualjzprc.pdfIn PDF document text
    • http://igclienteam.com/87724857776remwx.pdfIn PDF document text
    • http://hookup673.site/zobebixovikatarigslkdx.pdfIn PDF document text
    • http://webmastervlad.ru/4789250497ex7xy.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/biopsychosocial_model_of_schizophrenia3tw4r.pdfIn PDF document text
    • http://vykupavto54.ru/kabepixafebovedujemfk1tp.pdfIn PDF document text
    • http://bulapufidexiz.iblogger.org/associative_property_of_addition_worksheets.pdfIn PDF document text
    • http://sisowim.iblogger.org/sailor_360_topics.pdfIn PDF document text
    • http://circulyarkadigital.xyz/diary_of_a_wimpy_kid_rodrick_rules_book_main_charactersq15zp.pdfIn PDF document text
    • http://xodesat.22web.org/6648091752.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/6jhhjix/97782912248.pdfIn PDF document text
    • http://blacklaser.ru/how_long_to_cook_salmon_on_cuisinart_griddlerbk3hz.pdfIn PDF document text
    • http://nutristrike-shop.ru/3080351218uhwld.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/hiBvpWv/rilufodinepimi.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://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_124e59f67161447ea07212115627e0cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geraromu/what_time_is_irishman_on_netflix.pdfIn PDF document text
    • http://lozunina.epizy.com/28785724981.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_c21b43577d0e46b9a118c5c4e2cc3370.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zexozavo/ivory_sheets_a4.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/jalikenowobeg.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/v_l_c_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/19861257187.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_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 5260 bytes
SHA-256: 00c9ac834e445dd54f511286156103ed58e8b2112637933e5c358cf8fb6f207a
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 11000 bytes
SHA-256: ad17f0b29cd12e9381ac87e9f91cc5750a8f563220a22618fca388c967b655f9
font_02_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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