Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f77f848cd1b3fbc…

MALICIOUS

PDF

80.5 KB Created: 2021-03-01 11:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6e22739fd0db8d02a82a4db87a705359 SHA-1: 40bb4fe6216eef3b79d38330c0cb5f3c8781c86b SHA-256: 9f77f848cd1b3fbc987c54998550806a1c1e8cded1c504bccbd45a4d4d539d6e
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 phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity, likely aiming to redirect users to harmful content.

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://dugedepap.ru/strik?utm_term=does+bose+make+901+speakers+anymore PDF link annotation
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/1781260.pdfIn PDF document text
    • http://folejaf.mypressonline.com/606064658.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/64554158297.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/gutuxoniso.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/harry_potter_2020_trailer_italiano.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/suwal.pdfIn PDF document text
    • http://gufutaca1.xyz/how_to_use_steam_refresh_on_lg_washertf67n.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/68c60c.pdfIn PDF document text
    • http://qlemelest.online/sisazomaeusme.pdfIn PDF document text
    • http://arboozfilm.com/white_platform_boots_australiak06rs.pdfIn PDF document text
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/7296438.pdfIn PDF document text
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/a129c2.pdfIn PDF document text
    • https://puxugewukuniw.weebly.com/uploads/1/3/4/4/134492634/kitofanuk_wuzetakoj_newipuwilivar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorenetizufumuj.rf.gd/aula_de_espanhol_em.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/nogijemozofavu.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/best_email_template_plugin_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/32319309611.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_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 5588 bytes
SHA-256: 316090a6374b81c31f945db5a51a8cc6bf850cae61e2e342399a15e1b899215a
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11040 bytes
SHA-256: fc961141bdfb5ced13e2553070a9966222fdcb8f1e93fa3a66e5a658fea3ded0

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