Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bd725b0c009772…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 17:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 29e2df9878742b235afa0a49fb2f025e SHA-1: e6d02bd9a097e02917d9ac5df07dc767bff1385c SHA-256: a7bd725b0c009772351e476f67ab94daf8eac8ed1f34cadb753ea2d2d5102500
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'zajinet.ru/strik', suggesting a phishing or malware distribution lure. The PDF's structure and the presence of external links indicate it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=auto+share+wordpress+posts+to+facebook+and+twitter PDF link annotation
    • https://cdn.sqhk.co/funuwovo/e6fehhV/85141893428.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/79110671811x7cin.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/NhbrxVp/24717887086.pdfIn PDF document text
    • http://stakingyfi.com/nefulineditowulimoxafihkgab.pdfIn PDF document text
    • http://vilopeg.xyz/34064598798k7v3.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/hIhiMuT/tips_main_hungry_shark_evolution_mod_apk.pdfIn PDF document text
    • http://lonagonem.22web.org/vemupimogik.pdfIn PDF document text
    • http://magazok.top/what_does_a_river_runs_through_it_meanjdijd.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/gdRw1oP/t-_mobile_customer_service_number_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/PHLhiul/pixel_car_racer_tune_glitch.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/LbgfihS/40073272066.pdfIn PDF document text
    • http://bamigewagozajom.iblogger.org/buckeyemail_android_setting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegovogetaferop.epizy.com/jifisutifanerugo.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/10176596858.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/how_to_describe_raindrops_on_a_window.pdfIn PDF document text
    • http://fenutirumavilo.epizy.com/muwipejovafedulewebuguru.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/dewalt_mitre_saw_cordless.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/59069222734.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/35519766605.pdfIn PDF document text
    • http://bifezuragumizi.rf.gd/dna_replication_practice_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/anonytun_apk_apkpure.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5496 bytes
SHA-256: 33e711452b9fca4d48307a3573efb80e5ada80f948aebeafa3ca20de56c30672
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10476 bytes
SHA-256: 724a6f222c7283332549299592e81dc5cbcebafddda44e0f11356fe82bff210f

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