Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07fde520bd9fcb7…

MALICIOUS

PDF

73.8 KB Created: 2021-03-12 15:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa604763930260453b4fbeec1fbd94af SHA-1: b515d3e43bebf5054fbeeb2b717b9e14c64690e9 SHA-256: c07fde520bd9fcb740f252d7c903d09c436a89b2272fe2c321c0c04fff61f927
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or a phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/123?utm_term=dstv+guide++pdf+april+2019 PDF link annotation
    • http://missunik.space/asus_rt-n53_manual418wf.pdfIn PDF document text
    • http://flymoney.net/inocencia_interrumpida_libro8pdjx.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/jgUzXhj/zabuligeju.pdfIn PDF document text
    • http://alsamcctv.com/gezibrlicr.pdfIn PDF document text
    • http://world-wildshop.com/729589768102h152.pdfIn PDF document text
    • http://flash-sar.online/30707123735gyl4i.pdfIn PDF document text
    • https://cdn.sqhk.co/nivazesoj/hf5SEjj/sobosowenu.pdfIn PDF document text
    • http://findattime.com/fantasy_miniature_scenerys2ues.pdfIn PDF document text
    • https://fizupubiwox.weebly.com/uploads/1/3/0/7/130775838/ribiwotosebuma.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/xukoridijokupovunot.pdfIn PDF document text
    • http://gta-msk.ru/lemexajikijekepurisatamavgo9tx.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/NiaUKjc/velolojofeladifimal.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/jiGSGQG/nail_salon_open_on_sunday_mobile_al.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/ibjcjgG/wubuwewovuremidomonar.pdfIn PDF document text
    • https://xunipemadigorof.weebly.com/uploads/1/3/0/8/130813553/6976023.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/O7lijha/41588230388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_6017986e2360b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_5ff524bbb53ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fc9b772d1e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_602226fa682b1.pdfIn PDF document text
    • https://waduwira.weebly.com/uploads/1/3/0/9/130969623/wubewaxovu_pawadelikux_jipit.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/oTrgebD/65860452105.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/1121616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 5748 bytes
SHA-256: 3eb5123717f41a2e3d39e6f77cf2dd940372afbe033ffb69a7ee23d81746f03f
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 11436 bytes
SHA-256: 97c91e43916e7f2e8d6a0f5544443cf2d3073ae89d0f51a2152e502b82cb2723