Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb8bd457c66f6e4…

MALICIOUS

PDF

70.7 KB Created: 2021-03-02 03:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 355e6cf852241eb0342ea45d52830a2f SHA-1: b1cc509a3811e9356bd090400e392430a7bf3c3e SHA-256: bdb8bd457c66f6e4dc2569aa3b7403828b28ae41a6f122e0392d9ba38e924777
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a worksheet, aiming to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=dna+the+secret+of+photo+51+video+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/wotirixa/hjjfhfS/57140735253.pdfIn PDF document text
    • http://yellownatural.space/56604266753bih1i.pdfIn PDF document text
    • http://mebel-albero.ru/scanner_app_for_windows_10qdb73.pdfIn PDF document text
    • http://the-english-temple.com/27261862439axuf0.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/egdMIBo/vujefozekotuxomib.pdfIn PDF document text
    • http://constructionhouse.info/why_is_waiting_for_godot_called_an_absurd_playq27i2.pdfIn PDF document text
    • http://betmoy57.com/45167838564aq3io.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/gjaRtia/tixupu.pdfIn PDF document text
    • http://bet-info.ru/what_does_the_phrase_compare_apples_and_oranges_meank7fvm.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/jegjb4l/online_slots_free_spins_no_deposit_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/gvgjNLW/kodebudimuzugatiruloxuzi.pdfIn PDF document text
    • http://wellwork.site/composition_of_functions_worksheet_rpdp_answerszbei5.pdfIn PDF document text
    • http://goossyy.online/31781992046hf7i1.pdfIn PDF document text
    • http://myfavoritesun.xyz/voledasiwale71fut.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/mfj_993b_auto_tuner.pdfIn PDF document text
    • http://kostlike.site/police_request_cctv_footage_form5ea67.pdfIn PDF document text
    • http://thailandlove.site/ejemplos_de_monografas_universitarias17p04.pdfIn PDF document text
    • http://ttop-shop.com/94025391988s71io.pdfIn PDF document text
    • http://uanews.website/67954025948akiq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/how_to_fix_acer_laptop_screen.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5600 bytes
SHA-256: 8eda0b2941178ec698f5c2f606344c2549084d80dea9f4491c6120eff288ab51
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10196 bytes
SHA-256: bc87acbe9b09cb395a44fa3f9a394edae0a2a9e6742f89fecf89030f4e2bbfc8

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