Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d163a7b059dfa…

MALICIOUS

PDF

69.1 KB Created: 2020-11-19 04:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a0713a7d587bda23f4e7effa8933805 SHA-1: 1179e31424735413ed52cee50ec9bfbeb7048615 SHA-256: b89d163a7b059dfa84e54e7dbcf9a76fe35104814c356ebd1b3056bf1063ef1e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The embedded content appears to be obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a primary function of directing users to other resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=black+sand+beach+iceland+rock+formations
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/vukusuvojezogudegora.pdf
    • https://kunizemofowirux.weebly.com/uploads/1/3/4/3/134311671/zutogugokakajojewej.pdf
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fa93cc39d8ea.pdf
    • https://niginijepajenok.weebly.com/uploads/1/3/4/5/134505752/komixu-nigatidinu-leduzupuxo.pdf
    • https://lebaburi.weebly.com/uploads/1/3/4/4/134491334/dunor.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/a4c82ff663a.pdf
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mezuber.pdf
    • https://robivitoj.weebly.com/uploads/1/3/4/3/134334713/6244021.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdf
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/d17348f6b4179.pdf
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/boxazusanulu.pdf
    • https://pururejipe.weebly.com/uploads/1/3/4/2/134265449/2172547.pdf
    • https://cdn-cms.f-static.net/uploads/4407301/normal_5f9b700384b15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/somisilegex/gudijokikarudutome.pdf
    • https://s3.amazonaws.com/kakef/pulopiror.pdf
    • https://s3.amazonaws.com/sugosubexez/geviragixipubegasusa.pdf
    • https://s3.amazonaws.com/gapivegek/32252542090.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d060.bin
69e52ccf16e40412da77195adf3da90fb3dde04c796a314ae2da08fce6111192
pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 5512 bytes
font_01_sfnt_off0000e2f4.bin
1e4164e737dc9edfd8a0304da99b1ef094f7c83d80f724ba3edbccc0f9ae6f81
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 10644 bytes