Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ba4c93b0d2bc1f…

MALICIOUS

PDF

67.2 KB Created: 2020-12-23 08:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d98f15c1c144429c92127e50dcb06bc SHA-1: 081b59970949de43fb1f3658b9c721479cbc2e17 SHA-256: 55ba4c93b0d2bc1f2e25925a4a52008ec5164dc05c45e497346f45b0a284a162
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users. 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 embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffset.ru/123?utm_term=analyzing+linear+functions+worksheet
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/1132447.pdf
    • https://kotidirexi.weebly.com/uploads/1/3/4/3/134358756/fanukelelirubefenali.pdf
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/2604579.pdf
    • https://jenetekeze.weebly.com/uploads/1/3/4/7/134772573/50ab9.pdf
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/pujowafupavikuz.pdf
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/tiwaxelona.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/natorodapenad-mulakubib-mebiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3bc25683-275d-41a4-b13d-484280c337b9/meluxinutukisuse.pdf
    • https://s3.amazonaws.com/pivetuzadujo/conjunctive_adverbs_test.pdf
    • https://uploads.strikinglycdn.com/files/a12d1305-6667-4cda-bfc9-4d42aede0331/magellan_bryce_canyon.pdf
    • https://s3.amazonaws.com/xuvamuba/kizevezodanarisafakudew.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_off0000c6da.bin
69d49be188ea38708d64e1e08bcaf9ca025f7725a01903ed1d7ec531228c71d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 5440 bytes
font_01_sfnt_off0000d982.bin
7acc33424554b2729e6ba235cc45793fabb56350405e8cd36b70bcc5ab2be17f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 10880 bytes