Malicious PDF — malware analysis report

Static analysis result for SHA-256 b818dcf1ac949cb5…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 21:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75160b52ffdfd6799de344f8a012b90e SHA-1: b8b99d8721db440cd991b9a4b7a8d2c7e2e8382b SHA-256: b818dcf1ac949cb5613793a4e2aaa14f87a3974291dd6eef03fb785916412611
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or redirecting users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=can+a+person+with+type+2+diabetes+go+on+a+keto+diet
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5ff9edb2a4451.pdf
    • https://cdn-cms.f-static.net/uploads/4419832/normal_6033a2636d217.pdf
    • http://nulivanofika.mygamesonline.org/59116368583.pdf
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6019d5df012ed.pdf
    • https://cdn-cms.f-static.net/uploads/4407729/normal_60545a61cfb3d.pdf
    • http://gimatadokij.mygamesonline.org/38871833716.pdf
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/ropidusosireka.pdf
    • http://jaxifas.getenjoyment.net/62225481997.pdf
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5ffc664b4981f.pdf
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5fe7f0665732d.pdf
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6016229634af6.pdf
    • https://tofukoluto.weebly.com/uploads/1/3/0/7/130775982/giwadamovimejibugod.pdf
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/5401092.pdf
    • https://cdn-cms.f-static.net/uploads/4378425/normal_602e3763f08d1.pdf
    • https://cdn-cms.f-static.net/uploads/4494435/normal_600befe63faa2.pdf
    • https://cdn-cms.f-static.net/uploads/4449627/normal_601bb667921be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxegeza/16528547591.pdf
    • https://s3.amazonaws.com/fosagobomap/florida_keys_inshore_fishing_guide.pdf
    • https://s3.amazonaws.com/pesetufavo/bahrain_international_airport_arrivals_information.pdf
    • https://uploads.strikinglycdn.com/files/817c5ed1-d663-41c9-9160-8accfa313fd4/johnson_controls_a419_setup.pdf
    • https://uploads.strikinglycdn.com/files/b08b6627-82b6-4f17-9fa2-0b8c608fb8ce/ejemplo_de_introduccion_con_normas_apa.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_off0000eec6.bin
6f5ab9ee6a30bbda7a8470475f4a46d8cba089740b4b2efcc2ead5feb01ffb47
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 5624 bytes
font_01_sfnt_off000101e8.bin
debaf3ff37cadd88e03f56a1da1b20b0676acbb0c2dfc7de7569b922f44b7b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 1680 bytes
font_02_sfnt_off00010a35.bin
99076e05cb0f20c49e8b8ec2e4865d14a57c0cd214a14eab278c94ff75969c44
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 11032 bytes