Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcccaf25bfe69181…

MALICIOUS

PDF

86.2 KB Created: 2021-03-14 11:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 43258bf1ea29848eff91b3523c21ad1c SHA-1: 945fb3156140b3e3d41abc2efc2c631130f8300a SHA-256: fcccaf25bfe6918183e7a324902435351bf995bb25ed7d8ccdf2a4bca3efed39
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=which+is+the+best+book+for+yoga PDF link annotation
    • http://nakanilo.club/88694701810bpyd2.pdfIn PDF document text
    • https://cdn.sqhk.co/jujobomo/ifDjjlb/18680829735.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jbMPqEU/archery_elitetm_free_multiplayer_archero_games.pdfIn PDF document text
    • https://mukavotedi.weebly.com/uploads/1/3/1/8/131856112/negulidebapita.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/fBhhibo/merge_magic_wiki_wonders.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/tozaj.pdfIn PDF document text
    • https://siziloxa.weebly.com/uploads/1/3/4/7/134747516/b326c91e4851709.pdfIn PDF document text
    • http://healthyforczechrepublic.site/vanilla_wow_alchemy_guide_alliancevm76i.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/gisabugej.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/ehdoije/8555679699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepujevuzal.rf.gd/kelutejufitav.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_47ea47cd864b423587eb611e17483f5f.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_0b96564316ec471dba3159c4cf1894b0.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_ed830f3f86a245709db9a6aa13dba565.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73e788c-0564-4b40-8c59-728eacedd073/tesov.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_946c499c7f2140c8a97e84cb6f30fac5.pdf?index=trueIn PDF document text
    • http://mibavened.rf.gd/gopro_hero3_black_edition_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136fd8e4-5317-4a91-a56f-5edadf53af85/how_to_enter_promo_code_on_pokmon_go_iphone.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_85442e53e758455e80f78171ea452d7b.pdf?index=trueIn PDF document text
    • http://roraxekabitapoz.rf.gd/cannibal_corpse_eaten_back_to_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e698ff3-ba9c-4b63-992e-6568c051e4b2/58732494034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68cb0dd-7162-43bd-aff5-824a0f513f13/how_long_does_it_take_to_charge_tough_solar_g_shock.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_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 5432 bytes
SHA-256: 6f108abc8b65ef5011d77e961b68677578e2902e2a93ee4ebad57351ad992f0c
font_01_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 11296 bytes
SHA-256: 655e5b0d19b1d9abe55f3229a0a7a967c08c1617d95e23aa2acac339e91b2db0