Malicious PDF — malware analysis report

Static analysis result for SHA-256 f037d5f12f616374…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 05:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f348b48c189b35579618cf69674b0c24 SHA-1: 5a3e9bc6ea5a45b1c540e3b6e2cd518a3e55adfc SHA-256: f037d5f12f6163740a469f9bba6bc4514a8e59d1f32a727e45972442a901ef60
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=bose+acoustimass+10+manual PDF link annotation
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/2715055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd132474f12f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fdcfb1d06663.pdfIn PDF document text
    • https://sumibudagat.weebly.com/uploads/1/3/4/3/134310224/muxuvefajofuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_6057e9f7c6137.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/9787982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_606500f520ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd644e7aa517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_602f957540f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_6021171ce87b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fe1605d6675f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fcbbd92e2a75.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/fokokugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6003655c31111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_dc36d785c85c4f019169d5970919ff1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/8129327321.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_af3d3acafdd64c988b1fefcb71a49fa0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogunabones/24358904872.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4a3a0145d0f54f85b6f239724ad831bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/birds_pictures_for_colouring.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/hammonton_nj_police_reports.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_d3f5abc63e934fdfafa6c625c1b2283e.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_9d30378a681a4e7baa859ab7edf51b73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/20813222203.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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5092 bytes
SHA-256: af4fbfc69d63c8ecd71172196cdd6f334ee87fc119733557efbc9f8838688852
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 11324 bytes
SHA-256: 47160856564a8e1092aae77f22af8c43a4f9ec6f2103b0c725343391833db573