Malicious PDF — malware analysis report

Static analysis result for SHA-256 db518c87d2c3a721…

MALICIOUS

PDF

101.0 KB Created: 2021-02-08 22:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 837833e1f9f9b1a9e182a4354e76f266 SHA-1: 39c83f5df427d5d0524e864e2a4dd698a3847c75 SHA-256: db518c87d2c3a72107cd58ca177947616d4e9e2622c1706b61775befe7965658
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=drayton+digistat+1+rf+user+guide In PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ijdiguj/demomutumat.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/jobukifopos.pdfIn PDF document text
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/3217885.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/1f778be5b1f99d2.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/e52004d9.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/uFjjig0/babenis.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/Hibggjb/simon_parsons_tree_surgeon.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/manoretala.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/hgPJkIH/44938156397.pdfIn PDF document text
    • https://kiligazifozu.weebly.com/uploads/1/3/4/5/134506598/96139.pdfIn PDF document text
    • https://voromelub.weebly.com/uploads/1/3/4/8/134872571/1632457.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/6M9fjgU/modiribagodude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/zumewez.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/jamaxijilixuxosumena.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/bulejevazos.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/46118224488.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/antes_que_sea_tarde_vicente_garrido.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 2896 bytes
SHA-256: 9cd38b437c4a2d8519cf1b8a301fa578bab95e8ffc7dd47fc7126b5c86720859
font_01_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 5196 bytes
SHA-256: ba4e8b9665511cf4e19d5f9815bc5e3768ea52bf4ef05762dfff9d950dd84286
font_02_sfnt_off00014a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A16 2048 bytes
SHA-256: 25d164f712e53b55cd1c033dd6b17ace948cdb41dfc337ca6f3c0cda923b7488
font_03_sfnt_off000152f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 13080 bytes
SHA-256: ddb14c6eacb5f9c301e2a783c7fcdaf8cfce415d857ac8d277fad3ce1faee376
font_04_sfnt_off00017cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAC 2048 bytes
SHA-256: f64569174c0e3ec324597694821c7dc421885a83c6e6fccfa30df34c960b1e2d