Malicious PDF — malware analysis report

Static analysis result for SHA-256 9161f8f383a41550…

MALICIOUS

PDF

67.2 KB Created: 2021-03-06 12:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a9cd106f6ad3607d5aefc2b721baa393 SHA-1: d4f08c2f34a2dcb674079078a7fdf057ec8bf676 SHA-256: 9161f8f383a41550d0656cf50dbe5fde704d660bee399f9b96b189023fd5abc2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a link farm on disposable hosting, disguised as 'Toro 521 snowblower instructions'. This suggests a phishing or social engineering attack aimed at tricking users into visiting malicious sites or downloading further payloads.

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=toro+521+snowblower+instructions PDF link annotation
    • http://it50disconto.pro/penuzitexuluregokekawd8z6.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/begaxudimurakulobid.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/25098627368.pdfIn PDF document text
    • https://gikuxowatevu.weebly.com/uploads/1/3/2/6/132681634/2c4ab708cd.pdfIn PDF document text
    • http://lnstagramverifycentre.com/how_to_connect_air_hogs_dronek3gac.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/zupujodejenivadir.pdfIn PDF document text
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/tigagununakeki.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/woxojuxafopuv/molibegutozojanaratalu.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/picsart_background_editing_video.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/xemosubuz.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_900ee76cac3c494a9ce3db4db55cce8b.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_bd6cfda42971490d96e9265696979529.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_2b39bb643ca24b6ab68825b1df95abaa.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/how_to_replace_belt_and_rollers_on_maytag_dryer.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_3e594d829f2047898e218fdc9364bde7.pdf?index=trueIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_104d59108ad540b996e3079b295294ee.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_9f1faed4fb0b47d38bf562cede7bec77.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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 5072 bytes
SHA-256: 617f92edf6aae3c7a2045b0a5364ba23003da469d8ca65b4c9f9a7d241e87e94
font_01_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 10204 bytes
SHA-256: a0bbc80f27fb2c9427b9a8c854d89ca689bbcbc0381e8df4de657d9540752b57

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