Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb85c8a1eb195bc…

MALICIOUS

PDF

77.0 KB Created: 2021-04-07 02:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4eaf8f9484138f5d4f4368d010d3f5 SHA-1: e0b0f2960e9231e7939d3a77661b483880669666 SHA-256: 3cb85c8a1eb195bcd4a61f378c2fa720d890bc0f718aa9d280b5b9f164e62dc5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://crophysi.ru/strik?utm_term=black+and+decker+rice+cooker+instructions+rc3314w
    • http://copyrighthelp.info/pijopifibebez6y2l7.pdf
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/8817299.pdf
    • http://sentytld.online/arctic_wind_portable_air_conditioner_manual14xc3.pdf
    • http://technodom11.com/subtracting_across_zeros_worksheet_freeypcgl.pdf
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/wakofoko-lowagetogo.pdf
    • http://good-production16.site/what_do_the_four_candles_of_advent_symbolize_lutheran6jlw8.pdf
    • https://sawepaxir.weebly.com/uploads/1/3/1/8/131858353/xojubenedafadu_bujop_barefemagalap.pdf
    • https://tosafesixagosug.weebly.com/uploads/1/3/1/3/131383933/mexisixine.pdf
    • http://lerorelubujof.iblogger.org/31764789979.pdf
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/8345093.pdf
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/toruxawezuxezapizuf.pdf
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/nuweletabeguvoluke.pdf
    • https://filigewu.weebly.com/uploads/1/3/0/7/130738657/bedot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a07bfc4f-105e-47be-8c6a-737c78a4853c/flight_sherman_alexie.pdf
    • https://uploads.strikinglycdn.com/files/3fd4bd5c-d556-41ec-9f59-ebcfa9588331/xokasasopuje.pdf
    • http://jepisaf.epizy.com/calculus_limits_review_questions_and_answers.pdf
    • http://betudurinipop.epizy.com/strength_training_for_cyclists.pdf
    • https://uploads.strikinglycdn.com/files/b21c5777-a5d9-4127-8d37-ef0912491e81/15422487047.pdf
    • http://repiwefubuw.rf.gd/vapevaremidepebibajojuse.pdf
    • http://zakuvusebaj.epizy.com/baker_act_form.pdf
    • http://tapebujetunagu.rf.gd/fapugadipor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda7.bin
75589a0479720bd8afde9b04d16901ad4bef5edd60764bf345c2472a88305cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 5440 bytes
font_01_sfnt_off00010055.bin
defd56a8db9e738efb6360df26443f75d25443cd1da3e2042c57f8672a009d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11192 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.