Malicious PDF — malware analysis report

Static analysis result for SHA-256 08103cbd81a7fbcd…

MALICIOUS

PDF

80.2 KB Created: 2021-02-19 01:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 82be56dc91ee07cf36e7d83a3cf4557a SHA-1: e4bef72996fe1d1369efe70668f565df0faeb8af SHA-256: 08103cbd81a7fbcdb9561bec342738f6a2be5d5037ad0c30ac0eef8f1bc85679
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect 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 directly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=how+to+calibrate+a+temperature+probe+thermometer PDF link annotation
    • https://cdn.sqhk.co/papusabefo/hggfhbC/11569922630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fc6029fd017f.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/hhiahbe/burger_big_fernand_recette.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5ffc88c1d229c.pdfIn PDF document text
    • https://cdn.sqhk.co/zarudaletok/giPhaje/7090237707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389107/normal_5fedf429c8ed0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ff933cf3b016.pdfIn PDF document text
    • http://puwuditufu.22web.org/arcane_quest_legends_mod_apk_2019.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/pomapasurozuxex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413457/normal_5fc582d2d5ed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_600744918407d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5ffefb9d456c6.pdfIn PDF document text
    • https://bowasizavaxilek.weebly.com/uploads/1/3/4/0/134042597/5969803.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/b3d28f3771.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/bb3629c9e4a1be4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ff49b059bbb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lojizaruxaz.rf.gd/dulobonazumisad.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/zunuvurasaxonugidulagi.pdfIn PDF document text
    • http://lekedoxe.rf.gd/wagisewuradijegimi.pdfIn PDF document text
    • http://nobufep.epizy.com/23418557069.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/2008_ford_f250_service_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 4964 bytes
SHA-256: 346990d8ba6aaec06ccb77dc927ea2428a4f0fd9fb69197c1a6dc3690d23a5c0
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10576 bytes
SHA-256: 3011d62ec14e4d28cda0df6eb8dc8a6bc2d0e1dc256ce2e2f7313d4724a8a89f
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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