Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfd43d73f10478b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-18 05:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 46d3f5bb76b1f55769e6fdab8b5adc6d SHA-1: eb64657f63187a032679bd1cd50756e04af0f96e SHA-256: bdfd43d73f10478b5a13e142a8e41af159d6e8a7cb66db65e18dfa94705e27bd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/award?keyword=cerebrum+function+pdf PDF link annotation
    • https://cdn.sqhk.co/zufosupiz/CFxiaDF/64008769530.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/momotagagutu_borarof_lubogapiwe_zevaka.pdfIn PDF document text
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/9731939.pdfIn PDF document text
    • https://xadarerisisiw.weebly.com/uploads/1/3/2/6/132682239/aa8dcf4.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/gBvzqZu/minecraft_dungeons_dlc_review.pdfIn PDF document text
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/xojegadi.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/Uhbo8gj/xoom_money_transfer_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/icT2ie1/treasure_hunt_game_free_online.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/9510969.pdfIn PDF document text
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/9794197.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/ihjiibc/nchsaa_physical_form_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jal00gi/war_and_order_mod_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/XjarjaB/minecraft_pocket_games_plugin.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/voduzibaginesonib.pdfIn PDF document text
    • http://furunow.iblogger.org/wupaguzuxivez.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/ridixedewani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visagiza.epizy.com/10934008249.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/broward_county_library_volunteer_form.pdfIn PDF document text
    • http://wuxininozikup.rf.gd/kemurikalafukijok.pdfIn PDF document text
    • http://rixupod.rf.gd/fowabebunupesise.pdfIn PDF document text
    • http://suginuzebaluwom.rf.gd/16133543586.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 4928 bytes
SHA-256: c6ab3a9cce280a2b05d34237a5f5043cfe1662fdf929b688a19bb1adca96c1f5
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 10580 bytes
SHA-256: 31d3f70f41ab3d6e80ff3227febee460bd596ffa54f90c680fe9fb3bd6b40a30

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