Malicious PDF — malware analysis report

Static analysis result for SHA-256 77387d2ef22fda09…

MALICIOUS

PDF

74.9 KB Created: 2021-03-04 06:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 27a1cb19d7b74d18b07b5c7b97a15467 SHA-1: b836476971aa8866651b89d32a1d696aeadb52d1 SHA-256: 77387d2ef22fda09bbdf2d800e9f6c58e18fbaadfeecc59cb2049cd46e769620
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 embedded URLs, with one prominent URL pointing to a suspicious domain (`botokaw.ru`) that appears to be part of a link farm designed to attract traffic. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the document is structured to exploit search engine optimization for malicious purposes, likely to redirect users to harmful content.

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://botokaw.ru/award?keyword=rinnai+gas+heaters+for+sale+in+pakistan PDF link annotation
    • http://mibebar.22web.org/double_down_saloon_happy_hour.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/dc190c1db4.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/how_to_clean_filter_on_dyson_dc25.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/vowug.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/nudot.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/spider_man_comic_book_order.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/busojezekididefabam.pdfIn PDF document text
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/nupej_vofiz_wumewumiteru_budoditasanira.pdfIn PDF document text
    • http://lufavometazajur.iblogger.org/34360397775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulutugorivexek.atwebpages.com/27780289260.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/how_to_fix_the_pull_start_on_a_homelite_chainsaw.pdfIn PDF document text
    • http://gezugedabupi.epizy.com/rifebuforupexojovituzoji.pdfIn PDF document text
    • http://xekoxekezefewov.rf.gd/mamosagafudadumuremave.pdfIn PDF document text
    • http://bilunijo.epizy.com/hand_held_sheet_metal_flanger.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/9731615945.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/indian_historical_movies_imdb.pdfIn PDF document text
    • http://livofikozenaduj.rf.gd/fewugodugawuguse.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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 5232 bytes
SHA-256: 972c2256492c4d5949d063b756b8b9e469c98fb7ff78f69f35f2a1d30b4ff3e8
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10472 bytes
SHA-256: 0471c1cd875660e6d893a7cddc2a9ff785fc003cb14572412fc2f259601f58a5

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