Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bc8d5cdaf832fe…

MALICIOUS

PDF

72.6 KB Created: 2021-03-03 08:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 024f3fdc21c7972c1f06f9e3da636b79 SHA-1: 765839bb33c9eca69d639a1914260171e71110b7 SHA-256: b1bc8d5cdaf832fedf9357d8c5e0be6d6cd48f3b65f9a2d3a1ed2be55f14a210
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/wix?keyword=chemical+bonding+practice+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412762/normal_6000ad46c72fb.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/i4DjaNW/43062291845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5fca8c310b1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fe852e87c9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5fe9cfc2002b1.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/Kgfb5X5/dv_lottery_photo_tool_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_60059b65ee3cf.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/ghcifnu/city_coin_laundromat_bali.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/Mjcziaw/idle_island_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/hdgejj9/prop_hunt_portable_mod_1._3._5.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/GsHNhjS/arcademics_meteor_multiplication.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60371fda22880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393026/normal_6005e4842118a.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/xowasosuf/jijupirewozajuwuzuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/simplifying_radicals_worksheet_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/kademobebiwugikofaxij.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 5768 bytes
SHA-256: 6823c5736a49a1c4bbeb73762f93326cf3a062aeef80b0de64de180020e19b4b
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 10220 bytes
SHA-256: b5728cab4e0b3c73162f6719f72f6e123ab55ead87cd28c42d84e693a4447af1