Malicious PDF — malware analysis report

Static analysis result for SHA-256 43543f51211012d3…

MALICIOUS

PDF

77.2 KB Created: 2021-04-22 04:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dc31adae778b1e4f32692bcf405f7cdc SHA-1: 63bf693087ae29cdc8836b6f2ff8a69e21b0ec99 SHA-256: 43543f51211012d3e46a3848d84c626e63de03c2cbe3c25b2330532551a0917c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs disguised as a guide for installing a vacuum cleaner filter bag. The primary purpose appears to be redirecting users to potentially harmful or spam content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+to+install+stanley+wet+dry+vac+filter+bag PDF link annotation
    • http://jamotovoxut.mywebcommunity.org/doneke.pdfIn PDF document text
    • http://salet.store/natek0s41j.pdfIn PDF document text
    • http://laromuwutekino.22web.org/dewovefuviwokofi.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/actos_administrativos_em_mocambique.pdfIn PDF document text
    • http://my-favshopf.online/is_tao_a_good_brand86y0n.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/retinopatia_diabetica_sintomas.pdfIn PDF document text
    • http://tameenegypt.com/97981479820wno20.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/makalah_tentang_media_audio_visual.pdfIn PDF document text
    • http://haustova.com/hyperbole_worksheet_5th_gradeyux74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_d96bac2186494fc1a6ab586577ddd141.pdf?index=trueIn PDF document text
    • http://goxabepod.rf.gd/counter_strike_1._6_cheats_headshot_free.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_e72cf30711e24127929a8d2d8a0603eb.pdf?index=trueIn PDF document text
    • http://kosejoviwo.epizy.com/list_of_french_adjectives.pdfIn PDF document text
    • http://sukoxaji.rf.gd/fabudobasatejiridetev.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_bae017487d1844019fbe6798c15b2d86.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_98239afefcb747bfa1951433bd407f13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/honkai_impact_3rd_seele_guide.pdfIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_b1c3e81e58c346279119463f1271327c.pdf?index=trueIn PDF document text
    • http://zapudeni.epizy.com/dd_adventurers_league_character_sheet_spells.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/guide_rail_brackets_clamps.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/diablo_2_runewords_shields_2_socket.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_0ba72b074260418ba462fd440acd1f29.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_81cea442891a4449b78f77e5d6e8ef20.pdf?index=trueIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_d115812fa5e74847bfbcfc3bd889192c.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_8224364dee434722aca746b9df9ad7f2.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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 5544 bytes
SHA-256: fb288d14a0b8f8227530dc6ba7027c08b231eae4a3d952e68fd5aee5e6df03cd
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10780 bytes
SHA-256: 88905fc64bb2cb5fe22b59ed9cb245ec9cdddc7b06536b274394e76ddb274a6a

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