Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2938710913af53f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-30 01:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ec2bb16aa8e639347ca70751f1d5c9a2 SHA-1: c502360bd3bb740c53172a617851cfd079cf8439 SHA-256: a2938710913af53f151b7fceb4390b9e0188b433fb0202d71bfe7adb653c855a
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL, https://gimoguvi.ru/strik?utm_term=ernest+hemingway+books+best, is identified as a redirector for a free-download phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://gimoguvi.ru/strik?utm_term=ernest+hemingway+books+best PDF link annotation
    • https://cdn.sqhk.co/xolafunodo/Z1HjaEw/vifuremasowuwalav.pdfIn PDF document text
    • http://keysecret.ru/vemokunbnhz0.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/93843256625.pdfIn PDF document text
    • http://bobr.space/yard_machines_snowblower_carburetor_cleaning6ts0x.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/30546908197.pdfIn PDF document text
    • http://podeves.xyz/the_game_plan_2008_dvdunibv.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/WIjfijv/ranigakinebapejit.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/hihrogd/reaction_trainer_for_pubg_free_fire_apk_download.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://s3.amazonaws.com/woxotopapozokev/filosofia_del_derecho_juan_manuel_teran.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/91377523634.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/37803991752.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/angular_4_material_admin_template_free.pdfIn PDF document text
    • http://faxiwig.epizy.com/applied_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/what_size_file_to_sharpen_stihl_ms250.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/prueba_de_coombs_indirecto.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/jupoginugutugebenel.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/17634554508.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/50243656035.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5212 bytes
SHA-256: 1a687a3b9bbdae8ce3c291e7ff0d9feb5325544b3296347eeceff15627e21a30
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 11408 bytes
SHA-256: 9bb6c0c5a458b8097f2437ae902d839f3f98f45c166238df27b13baf3d37df27
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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