Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b551ab2dcfa13f9…

MALICIOUS

PDF

75.7 KB Created: 2021-02-18 08:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 43d7bf78df1ff6c851249ec7fc62fef3 SHA-1: 01ffbbddc7eac39cb88f48cebd87823dc9618008 SHA-256: 8b551ab2dcfa13f9745ed03bac0acbd85d704b76fb950b6fad1cee703e2a3147
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/123?utm_term=i+am+bad+guy+lyrics PDF link annotation
    • http://cmb-societe.com/electrical_installation_wiring_diagramsnjjmh.pdfIn PDF document text
    • https://cdn.sqhk.co/guletema/SjjhVia/comic_blood_link.pdfIn PDF document text
    • https://sagetiruguw.weebly.com/uploads/1/3/0/8/130814856/jiguzu_zijozawuluje_nozutizom.pdfIn PDF document text
    • http://jifixadilo.22web.org/wuvabur.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/8440306.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8r1MRHy/siwibefotiduxidudenafomen.pdfIn PDF document text
    • http://itasummer.fun/the_travels_of_marco_polo_the_venetiansj9ai.pdfIn PDF document text
    • http://pornbustyvids.com/clash_of_lights_s4_apk_updateehoxd.pdfIn PDF document text
    • http://tosety.xyz/ci_tt_mt_trong_ting_anhs4fip.pdfIn PDF document text
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/71e9bf3e7.pdfIn PDF document text
    • http://bristol-yalta.run/my_froggy_stuff_printables_school_worksheetsnh0r9.pdfIn PDF document text
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/nelusilitezesekagefe.pdfIn PDF document text
    • http://it50disconto.info/rafegofonanivosugexow651p.pdfIn PDF document text
    • http://ninozefumuwu.iblogger.org/36572240851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosakiviga.rf.gd/gulap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 5440 bytes
SHA-256: 87f72c8b07ed5ccb3a14d06b3980a9a60ae923ddc4937944b220b06d9a3d95c4
font_01_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10904 bytes
SHA-256: ddebb77cbc4a0cfb9beff1c0622bd648e13e0432bb01ab6a049ab063131936ce
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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