Malicious PDF — malware analysis report

Static analysis result for SHA-256 571875f7cd25ce19…

MALICIOUS

PDF

77.1 KB Created: 2021-05-16 07:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 18d4ed421d382b32c35e8c8ecf688830 SHA-1: 7cd0c037759122a8b048d9c92245e6907aa2dd87 SHA-256: 571875f7cd25ce19e71a4e865cde5bf3d61974c910c38d5e299240c3a7aaa5bf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=canon+business+process+services+inc PDF link annotation
    • http://dewiluvafaridi.22web.org/coran_audio_al_houdaifi.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/cwCiShi/56354498188.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/rNjgejb/cosmic_kids_yoga_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/geHLCji/pixel_gun_battle_royale_online.pdfIn PDF document text
    • http://widalatipuna.22web.org/duzewurufutemodewodixegal.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/gujdl7F/38236640193.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/3QGgcha/50293021157.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/nnoLghm/97136294128.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/iduFkeo/silverado_stepside_bed_liner.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/dukavunivifa/xizumevuxuza.pdfIn PDF document text
    • http://pofomabagemekut.epizy.com/adobe_premiere_pro_cs6_video_editing_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/bleach_vs_naruto_free.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_ec06a25d55e149ea933c0876a6f41bdd.pdf?index=trueIn PDF document text
    • http://tofepabozamawur.epizy.com/kovilajadakus.pdfIn PDF document text
    • http://nuzejotegaze.rf.gd/abandon_all_ships_geeving_album.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_9399f8b3906e4b84b185e558a1e5a241.pdf?index=trueIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_30e3b380cdd248fe889d9ca8613e350e.pdf?index=trueIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_c7f565fe34664916b264d576a9e371f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/living_nonviolent_communication_review.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_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 5000 bytes
SHA-256: 39ee756a442ad52ff23070f342b2443366c30f3393b1dc59eb0b214800cfa5ea
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10824 bytes
SHA-256: 845b9c1fb455d41e0f25242287f105a6585ba18ca57c23d3d9ccd2002a723a0a

Open this report in the interactive analyzer, or submit your own file for analysis.