Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6821076c9a33d4…

MALICIOUS

PDF

80.3 KB Created: 2021-06-09 05:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e44884ae4cb5fd83498edde52eb8a48 SHA-1: b55d1d0c5629aa7c23388bd6ae0839b1a360907f SHA-256: 0e6821076c9a33d498d6b3a6294e7206286115ff7c39d7877022e442d5cb4659
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of embedded external URLs, with the primary suspicious URL being https://jumiwimov.ru/. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=pacman+games+free++windows+7
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fda211198406.pdf
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/fec5bad5086.pdf
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/14dae9.pdf
    • https://nudareniwode.weebly.com/uploads/1/3/1/8/131856427/verafagizaz.pdf
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/pekow_bexasu.pdf
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/pafimi.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_600b640e414c8.pdf
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/lisomitofixu_dugirik.pdf
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5ff0b1ab8cd86.pdf
    • https://sisemukogonutop.weebly.com/uploads/1/3/4/2/134266332/6c6ae6ed50.pdf
    • https://cdn-cms.f-static.net/uploads/4369343/normal_602c4b9187fbf.pdf
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/8608028.pdf
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/2311799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://metudebebi.pbworks.com/w/file/fetch/144646026/sadifawudojowexobozazigu.pdf
    • http://didaneguk.pbworks.com/w/file/fetch/144629142/34406413738.pdf
    • http://kiletejude.pbworks.com/w/file/fetch/144412560/54547765168.pdf
    • https://uploads.strikinglycdn.com/files/bf414e65-71c7-45b6-a669-dec81af94153/muscle_cars_for_sale_craigslist_idaho.pdf
    • https://uploads.strikinglycdn.com/files/37bcd5af-4b49-4761-96fd-6d35c66ee103/why_is_efficiency_important_in_healthcare.pdf
    • http://nilanom.pbworks.com/w/file/fetch/144416133/gexanefodolotidise.pdf
    • https://uploads.strikinglycdn.com/files/0fb9372e-65cd-4b99-8b11-742629ce5a52/97453427378.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef38.bin
cf1d109ea54d18baa1e39c4f52469c2bd19797a95e3d55837df6a3773b1d47bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5188 bytes
font_01_sfnt_off000100ce.bin
632cc6a6802bd364bc46c3cfbbf8e16f202bfdcfbe927571abbb7cb3c929f9fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10740 bytes
font_02_sfnt_off00012575.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 4324 bytes