Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a081b10c801a787…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 01:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8695e951bb16f8094c923c736197c7d2 SHA-1: ecfc7f976ca82c380a6611fd7ea7c7de5eabc9f1 SHA-256: 9a081b10c801a78739c3285901448bd4dd59437d8a7929d13a9f4f5bfdaecc45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming attack pattern. The document body is heavily obfuscated, but the overall structure and heuristic firings indicate an attempt to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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 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://synerhu.ru/uplcv?utm_term=connect+android+box+to+laptop+via+hdmi PDF link annotation
    • http://minuspk.ru/minuspk.ru/userfiles/file/10196445839.pdfIn PDF document text
    • http://wenxuezj.com/images/File/65152542147.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/56016962504.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/sozataba.pdfIn PDF document text
    • https://patc.fr/imagesfile/24741996691.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/magumezab.pdfIn PDF document text
    • http://fruitvita.com/files/files/kizalibu.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/80711546503.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161422efa88349---limakukepufesonulugavefu.pdfIn PDF document text
    • http://movediary.com/userfiles/file/bufesosexi.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/92442607450.pdfIn PDF document text
    • http://katachizu.com/img/news/files/12952899079.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/mapegivorazupekunoxog.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1doqa0a5k2rc38v342qm9gqua4/xutagewuzazugobaxomupeg.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091209564156.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/92804823033.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10822289408.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/gofolusifovojokam.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/zunovabuboselejejumu.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/megomupilo.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219101957454174.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/73850846412.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/72039689228.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 18516 bytes
SHA-256: eb34f2cda01042f86d4f87106422d372c2c5d79e9fd4764623873c84209f38b5
font_01_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 10948 bytes
SHA-256: dfed22e1a2d279de35efc59af3c345b302bed72ffdd093b88c72eb7082976b09
font_02_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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