Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e10246f639659c…

MALICIOUS

PDF

72.3 KB Created: 2021-01-15 00:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e663b125c352b5c2db56c94143f66879 SHA-1: dcb33a914a5bca910ac51e4858b685aab85f6a61 SHA-256: 56e10246f639659c8974f2a8f776fd87c6d1931c12e7f7eca09f47823df9f2fa
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, appears to be a lure related to 'bereavement leave template', which is a common pretext for phishing attacks.

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://traffset.ru/aws?utm_term=bereavement+leave+template PDF link annotation
    • https://cdn.sqhk.co/bogulevim/hcciajf/playstation_direct_twitter.pdfIn PDF document text
    • https://site-1176791.mozfiles.com/files/1176791/high_heel_shoe_storage_ideas.pdfIn PDF document text
    • https://site-1173509.mozfiles.com/files/1173509/wic_baby_food_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hihiijK/diy_face_masks_for_blackheads.pdfIn PDF document text
    • https://site-1177446.mozfiles.com/files/1177446/best_soap_ingredients_for_sensitive_skin.pdfIn PDF document text
    • https://site-1168054.mozfiles.com/files/1168054/7259753592.pdfIn PDF document text
    • https://cdn.sqhk.co/sazoteva/eNgdyid/virtual_life_simulation_games_online_free.pdfIn PDF document text
    • https://site-1208355.mozfiles.com/files/1208355/9777428837.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/hi0ha4w/78138532198.pdfIn PDF document text
    • https://site-1176360.mozfiles.com/files/1176360/zewoxiwemotaz.pdfIn PDF document text
    • https://site-1179882.mozfiles.com/files/1179882/pokemon_emerald_game_corner_guide.pdfIn PDF document text
    • https://site-1196120.mozfiles.com/files/1196120/widimiwiluban.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/74863889990.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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 4896 bytes
SHA-256: da1793288d791a00bfb4d7a0b7d9a3b4593557465b6bf945c4379ed28c71c91e
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10604 bytes
SHA-256: 028ebe17cf680c8d5d59c035ba18782a8bededcc45f2b63985001e8fdef164fc

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