Malicious PDF — malware analysis report

Static analysis result for SHA-256 a793a4420e705256…

MALICIOUS

PDF

109.7 KB Created: 2021-03-30 01:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 55bbab348f40d1d8f3af92c6fc2fda8a SHA-1: 67eebc322568bd673d7e9d26801824e7752de935 SHA-256: a793a4420e70525642638e6c1d5b48d2d9ebd7f3bd006a134e1f387b3abb4344
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though partially corrupted, contains keywords related to 'Vestimenta de la mujer cristiana pentecostal' which appear to be used as lures to disguise the malicious links. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing or malware distribution attempt.

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://jacksth.ru/wix?keyword=vestimenta+de+la+mujer+cristiana+pentecostal PDF link annotation
    • https://cdn.sqhk.co/rubalibuzodi/ciigi5W/adorable_pokemon_wallpapers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_6036d5f617569.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/eijNibP/89639217367.pdfIn PDF document text
    • http://fufibubesex.iblogger.org/12333780118.pdfIn PDF document text
    • http://muwabiva.iblogger.org/rovaketirarij.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/EWhcNgh/magic_carpet_mini_golf_galveston_prices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_60584fc3853a5.pdfIn PDF document text
    • https://cdn.sqhk.co/liritefebat/fr9EJhh/48639645503.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/bz2gphb/1421143730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_6022adf036bef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420610/normal_5fccfd96a59c5.pdfIn PDF document text
    • https://cdn.sqhk.co/wepenujofow/zkhbhbc/one_picture_is_worth_a_thousand_words_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafexegud/53501374594.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/30350825002.pdfIn PDF document text
    • http://somukagokololu.rf.gd/82757106572.pdfIn PDF document text
    • http://bumelujezi.epizy.com/black_cherry_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/fulitiroxewopuk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170CB 5260 bytes
SHA-256: 372672c7ae30087a719af3c39020edab4c561f4751348a05cdf6e45f5e4c785f
font_01_sfnt_off0001829a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829A 12128 bytes
SHA-256: 8e5030ed4568c601150da6f79825d97c264f8d1260d5b49ec4ce02853d65e10a

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