Malicious PDF — malware analysis report

Static analysis result for SHA-256 78688bf54241ec2c…

MALICIOUS

PDF

87.9 KB Created: 2021-03-17 03:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7ba147f60ddd151928a7af505be605ab SHA-1: c4b02309c7c05051a9fe344b78f8d4a141861d6b SHA-256: 78688bf54241ec2c1857721b401e481cbdee92d69c41dd1bad04edfd606d2da1
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many hosted on disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers strongly indicate maliciousness. The PDF's structure and embedded links suggest it's designed to redirect users to potentially harmful websites, aligning with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=in+search+of+answers+destiny+2+quest PDF link annotation
    • https://cdn.sqhk.co/rugofufol/ieXiblq/desmos_graphing_piecewise_functions.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/11664f8bbd.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/sistema_endocrino_anatomia.pdfIn PDF document text
    • https://cdn.sqhk.co/rejelozekazo/igfhbwQ/jokufepunosenewagar.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_to_replace_stove_top_knobs.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/pirobel.pdfIn PDF document text
    • https://mosofekux.weebly.com/uploads/1/3/1/4/131437457/gufup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pekamidakoj.atwebpages.com/gedixigijapajenuk.pdfIn PDF document text
    • http://tanonarimunal.myartsonline.com/evh_5150_iii_combo_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fde215d-5ae2-4df1-a2e9-b92aeb3fa30b/70312767320.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/gaguwalol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9c1bfe-0010-4927-bbf3-9d83fe45cd94/xepaf.pdfIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/64486804950.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/sikadopab.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 5348 bytes
SHA-256: 486b02811a7c4810c3fc9d38fd99da0ea69ec62c168ef22a805d61cf2e32af68
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 11052 bytes
SHA-256: 0c0a878943c15bc39d9366f9dc7f20f534ae0fd6231da9a9a87cfb2dd73ad7be
font_02_sfnt_off0001446d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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