Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de55d33ad22d368…

MALICIOUS

PDF

76.0 KB Created: 2021-02-16 02:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1124cee42d074c6255eb6dc0bce31296 SHA-1: 4208cc02fcadf87048b24791e5b9df16cc0ac091 SHA-256: 9de55d33ad22d3686606f479791f770b0c3d292c78d800f7c57c647af72dc7d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on Weebly and other dynamic DNS services, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'Graco literider lx travel system manual'. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics indicates the primary function is to redirect users to potentially harmful external sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=graco+literider+lx+travel+system+manual
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/zegawav.pdf
    • https://cdn.sqhk.co/benibavagoge/6jgifji/52068910945.pdf
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/zaxisulikigodo_zapajuvijo_disokixofalugu_gizufujod.pdf
    • https://cdn.sqhk.co/rogapakaler/hjSmSif/2xl_mx_offroad_apk.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/33836.pdf
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/3e271a85b9159d.pdf
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/gogenifilisi.pdf
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/9eea8.pdf
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/taziwubowixomif-lobefapakem.pdf
    • https://cdn.sqhk.co/rujiwujik/dBheVgj/16982263889.pdf
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/2b33a806.pdf
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/nepokilimepov_redibepikeka.pdf
    • https://cdn.sqhk.co/dobexesi/hjfpDja/44159616414.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gidibesuxi/deficiencia_de_vitaminas_e_minerais.pdf
    • https://s3.amazonaws.com/sizabo/clinical_anatomy_of_larynx.pdf
    • https://s3.amazonaws.com/bezutu/21966623408.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_off0000d383.bin
ffad0b35cc2e0d3d509c5b4f12f856c6dbc9dfb3f77bb187be40bd6154957574		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 7772 bytes
font_01_sfnt_off0000ed93.bin
4bdb3064e0b3e64ad0d3c83612ccece2b151fd4b6f9f01f1d159877db79cea96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 5348 bytes
font_02_sfnt_off0000ffb7.bin
7c3bdd544307b1d8f2da2ddab0ded0385188e3001106b97aaf217a64be5c1a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10064 bytes

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