Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6423b36df237ac2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-04 02:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 237a4f8f73929fa2fe99b74500f2cd26 SHA-1: 57a4ea94d6276f70129db43d150899576621a401 SHA-256: a6423b36df237ac2dd739b0796d05b64bbeba8a5b3af9576b4a8ddedcd614644
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://mezovuduw.ru/wix?keyword=properties+of+biological+buffers+lab+answers', suggesting a lure to a website that likely hosts malicious content or phishing forms. The PDF's document body, though partially corrupted, contains keywords related to biological buffers, reinforcing the lure. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a potential link farm or redirection scheme.

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://mezovuduw.ru/wix?keyword=properties+of+biological+buffers+lab+answers PDF link annotation
    • http://desokore.medianewsonline.com/how_to_use_salicylic_acid_for_psoriasis.pdfIn PDF document text
    • http://bilapak.66ghz.com/fegegogeza.pdfIn PDF document text
    • http://wonuwomola.iblogger.org/counter_strike_1._6_game_apk.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/56032300584.pdfIn PDF document text
    • http://wilexani.22web.org/filmywap_2005_bollywood_movies.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/zubata/dc_comic_books_for_sale_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/kugefuxaw.pdfIn PDF document text
    • http://bojefej.epizy.com/nonelozarasadolarel.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/96769426988.pdfIn PDF document text
    • http://nuwenukaxoxigam.rf.gd/vinyl_flooring_safety_data_sheet.pdfIn PDF document text
    • http://tiderunes.epizy.com/furniture_reviews_consumer_reports.pdfIn PDF document text
    • http://seluzapiz.rf.gd/microsoft_word_2010_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/vosalojoraderepanezejuvi.pdfIn PDF document text
    • http://najizomixa.rf.gd/82618971702.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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 5416 bytes
SHA-256: 37d96884de753478c03b198919fa9f1a3eefd1ea9aae1d0fec4c4cd836cb94f6
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10436 bytes
SHA-256: 6ab1a9d97f3524afc2516b7acae1b2310243e0d8d5ff5cd2b04ca0e626dc92f6

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