Malicious PDF — malware analysis report

Static analysis result for SHA-256 44be319130b46ae8…

MALICIOUS

PDF

72.7 KB Created: 2021-04-14 10:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 434bc7887c1975a15869fa7a38fcda1a SHA-1: c6cf2796e9f667f9f2d278a695c3bc5b84ee0df3 SHA-256: 44be319130b46ae819bcb580666164686d8b7e0b1fed64823f13428e75f2fa6e
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 of which are hosted on disposable domains or redirectors, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=unitypoint+methodist+medical+center+des+moines PDF link annotation
    • https://cdn.sqhk.co/wulupumiwi/idiikYO/bird_of_paradise_plant_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/WDjhhg7/16197040046.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/aiiuugi/90738922255.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6156ba0-be53-4ce8-b650-382e30fe1098/remington_700_adl_22-250_bull_barrel_twist_rate.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_7760fcbeadd342069d82695c4bd834f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/asos_red_formal_dresses.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_43f2f8c7b4d54397bbcc716bef9cc7ca.pdf?index=trueIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_ed02ed34954641c29126dd065384d970.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/free_vpn_server_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f48ec3-aed5-441f-a538-0f0c50a261dc/91794048606.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/logic_10.4.6_system_requirements.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_0f890ccdf8cc42e0a8cc74e87063d60e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/toleli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7da7005-c609-4fcb-9323-8d9887d9a2f9/brady_games_final_fantasy_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9057e1d-78e3-41e8-bd71-2b919489b609/pudufapaxiju.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_e6355a0f97fc4fbba5716d9cc99e19a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7684233e-41af-4f55-b809-176e658b5ca5/the_game_changers_full_documentary_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14b5c36-44ba-48a1-ab0f-a76bf11f7b17/mesavoliwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008b70a2-9aa1-4a82-831f-6c4fe6048294/whirlpool_front_load_washer_troubleshooting_guide.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_8be7d64179ba4f988220d76241074dfd.pdf?index=trueIn 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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5408 bytes
SHA-256: 44431cb964b048ac0e7f18a560a7897e1bd899c022def2407df1ffdefa1e8137
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 10888 bytes
SHA-256: 67713dedce90a966eb925c046d204d8d1b1917f8c5b1df5dacc4a9206cb8f7c6