Malicious PDF — malware analysis report

Static analysis result for SHA-256 899563ac90ae49c7…

MALICIOUS

PDF

75.1 KB Created: 2021-05-26 17:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: efaa7c89a98e1ec2ab6e49bb068055c7 SHA-1: 728b95e2ea653d59ab5c4d82af9c9898ab42d3ff SHA-256: 899563ac90ae49c7c28cd07a946f5d684fc7b369ed199104470ecc2029a61fa6
156 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is 'https://kuzutuzo.ru/strik?utm_term=the+sims+mobile+app+cheat+codes', which is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=the+sims+mobile+app+cheat+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366630/normal_604b1541a41f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_60219480340bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_604937b901c1b.pdfIn PDF document text
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/40fa0df286a.pdfIn PDF document text
    • https://sozikusek.weebly.com/uploads/1/3/4/3/134333331/luvosefotema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_604685f518ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_604a81229ce71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d31fce7fd.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/zugogefobuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5fe88f8a33105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bbe32f-e4b5-41fa-a57d-953099e771e0/sibonumamuwadabovesapam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143d7433-200e-46d3-a863-c47fc8b7628d/driverack_pa2_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58513b13-1520-498e-afdc-e2e4f2bb00e0/nitonal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92c3368-0b4e-46e3-9d27-71cd4566ab22/how_to_reset_a_fios_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d9bdd2-5aaf-4a77-be8b-c1d9dd0f87cb/50685992675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b28577-8ec8-4cad-8a18-3cd789811392/zizozoxedud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0340f0d-8992-4402-96fd-9e063fc1d6d5/29641175028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02b38b6-fa82-4d70-9ad6-2d75c52923c3/35756566440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d3b678-5131-4d53-924b-644ea7d00a22/94713415040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a516dd-b38c-4c2b-a24c-b5440f8ccb58/profiles_in_courage_essay_contest_2019_winners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b767932b-66d0-4e8c-a801-12bc99f2e42b/plan_de_estudios_2011_primaria_primer_grado_espaol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5304 bytes
SHA-256: 4bf4f47758d4b9738ca6dc629bff43ad03f36f588019785c3bbd039c8a85c404
font_01_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 11452 bytes
SHA-256: bc19911d70fe2eb0140fef8ad3e11db59453b8c53353da9e9b12b461bbba0918

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