Malicious PDF — malware analysis report

Static analysis result for SHA-256 a891ca0b08aee05e…

MALICIOUS

PDF

78.5 KB Created: 2021-05-03 08:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4d20c0bb7183c08b34634f6033352012 SHA-1: 5b467a73d69f149c6260841b4f0a5122053cfe0f SHA-256: a891ca0b08aee05e1b26040f347329b6bd90793f0d9aa8dfe566eff402e56fb4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting and another flagged by ML classifiers as malicious. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution intent. The document body, though heavily obfuscated, appears to be a lure related to a product review, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=fiio+x1+2nd+generation+review PDF link annotation
    • http://replyua.site/14317934921p3xe6.pdfIn PDF document text
    • http://vumegebopim.iblogger.org/process_of_performance_appraisal_in_hrm.pdfIn PDF document text
    • http://bozerizafe.22web.org/sun_joe_2030_pressure_washer_not_working.pdfIn PDF document text
    • http://srakan.space/what_age_group_is_the_book_coraline_for03rbx.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/ciclo_escolar_2020_a_2021_calendario_sep.pdfIn PDF document text
    • http://sehq.xyz/tecsun_pl-380_manualscrhi.pdfIn PDF document text
    • http://waguzeb.66ghz.com/aace_hyperlipidemia_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_1bd30caf0afb4d7fb798d0a777fbe47c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/talebalumoxewises.pdfIn PDF document text
    • http://zopefunexot.epizy.com/cardiovascular_system_terminology_worksheet_quizlet.pdfIn PDF document text
    • http://nuvefugokudob.epizy.com/petri_dish_grid_template_printable.pdfIn PDF document text
    • http://tasagut.rf.gd/47710759103.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/what_is_maritime_law_mean.pdfIn PDF document text
    • http://papenepalekar.epizy.com/free_volume_at_price_indicator_mt4.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/virarisoforobida.pdfIn PDF document text
    • http://nirobow.epizy.com/kemini.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/parts_of_speech_worksheet_with_answers.pdfIn PDF document text
    • http://jowufasekijef.rf.gd/61601659387.pdfIn PDF document text
    • http://pikididubemet.epizy.com/75617155934.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/m_butterfly_play_characters.pdfIn PDF document text
    • http://popadugabi.rf.gd/wrong_turn_movie_online.pdfIn PDF document text
    • http://dexegesen.rf.gd/lasko_box_fan_replacement_feet.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_784282cbecca4d5ca334db3bf29c5bc5.pdf?index=trueIn 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_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 5140 bytes
SHA-256: 7585a17d4650255a4989249365afc8a65e34aa37d1360d0317f594dd931cbcd9
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 11016 bytes
SHA-256: b480e4d339ccfd3b31ece3e6eb5fb7d25f0555ae912264ee0220f54c92c7a338

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