Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c324d99f8c0de7b…

MALICIOUS

PDF

101.3 KB Created: 2021-04-04 10:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e25fd38db4ff4dc478c3bbed47e024 SHA-1: acd67150b0d85ce84c30652030f581830b7b0a0d SHA-256: 0c324d99f8c0de7b52069a23e1ed362bac5c32f9c27bfc6f24c703892f818f0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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/strik?utm_term=does+google+photos+eliminate+duplicates
    • https://vufoduvetuf.weebly.com/uploads/1/3/5/3/135302170/gidanoke.pdf
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/a3c0896fa.pdf
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/nemopovuluxopa.pdf
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/dapikigaj-kazujug-ruwebekalesumiw.pdf
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/27648ea6b6a.pdf
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/a26a1cf179103f4.pdf
    • https://farunekigevizaj.weebly.com/uploads/1/3/5/9/135976182/5275485.pdf
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/c82b226b5898.pdf
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/4018322.pdf
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/c384ff1fd2b136.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kizumomukuve.epizy.com/dapij.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_a2a06d67d39c4de9ab64203bc43e70ad.pdf?index=true
    • http://bujozedaworora.epizy.com/zositowad.pdf
    • https://s3.amazonaws.com/minabiwa/nesowiwuluwusojezuruno.pdf
    • http://lawazujazigefon.epizy.com/10944953044.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_bb67160dfdfb4c8d990517917d31f8ff.pdf?index=true
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_39bd0fe9500949438b46e67f3c3c76a1.pdf?index=true
    • https://s3.amazonaws.com/julaxel/diweveja.pdf
    • http://tixuxunu.epizy.com/delesotojakebe.pdf
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_bc93ee34dbd94803941a286f1a9af45e.pdf?index=true
    • http://vowidifasiva.epizy.com/50199694216.pdf
    • https://s3.amazonaws.com/minaxigevani/zifezamura.pdf
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_9db81a7606724d56b4b7674081468e43.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cbb.bin
26c9941d02e51621611c308054dae2e511e241081c50da3631324f67a588e3fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBB 5388 bytes
font_01_sfnt_off00015ef5.bin
ab272e7581a6c56fa30920bd8bbefeef7c3014a96da9aee98b4f223f02636f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF5 11972 bytes

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