Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c7fc4466ab30e3…

MALICIOUS

PDF

72.7 KB Created: 2021-03-13 15:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d1f7dc0e5341bec0f3fb466cab3a9b1a SHA-1: 9e5e4f2da4be9046d621f1cfd486e12bfaf881a1 SHA-256: b9c7fc4466ab30e3306de4c3a4a4c4b8036f066ead141f351cc32fc6334908a2
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, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to potentially harmful content.

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://druttle.ru/award?keyword=atos+normativos+pdf PDF link annotation
    • https://cdn.sqhk.co/xasakeza/jbA27sy/fonigevazumuku.pdfIn PDF document text
    • http://rimiminigi.22web.org/adherence_to_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/tge3bqB/vegetable_chopper_cutter_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/jffjcjh/57275655192.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/ieie1gi/tiger_shroff_song_2020_download.pdfIn PDF document text
    • http://toxaxugepevu.iblogger.org/sample_church_flyers_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/towitudamuga/iguhajg/dune_buggy_for_sale_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/4TggJji/49313944457.pdfIn PDF document text
    • http://wedabefepa.22web.org/31729210260.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/gnbDV7E/51419015607.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xusexupilaru.epizy.com/how_to_fix_whirlpool_duet_washer_not_draining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33aee471-bad8-4ea6-8421-915c7d6cadf0/pipuxekepufuvunob.pdfIn PDF document text
    • http://gotozowixefe.epizy.com/cumulative_relative_frequency_graph_worksheet.pdfIn PDF document text
    • http://vevenamefod.epizy.com/bearing_capacity_of_stratified_soil.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_51018183da2c464590b39f98122366ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6891890-0246-4bcb-8fef-d41227e837d4/the_game_awards_2020_fortnite_announcement.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_6255aa18df0f4f79bd008f06f11d3a7c.pdf?index=trueIn PDF document text
    • http://woxebolinos.rf.gd/icloud_for_pc_free.pdfIn PDF document text
    • http://vipojidetag.epizy.com/how_to_naturally_draw_out_blackheads.pdfIn PDF document text
    • http://lagunuriteg.rf.gd/how_to_breastfeed_once_milk_comes_in.pdfIn PDF document text
    • http://lilosifudi.rf.gd/seneberalij.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 5204 bytes
SHA-256: 6f67e8ecbf6d5e4a460812a2367284fa9cc73c849655c2d999dd2dae07d80522
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 12608 bytes
SHA-256: f5e59c6c97a1299202792ce1ad6fd8c3789d8d3399306ee34303caae34939344

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