Malicious PDF — malware analysis report

Static analysis result for SHA-256 398c00dfaa36e6c9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7e741b79c8ac85b49805a4cf8f432e80 SHA-1: a4bbe71b4bc15a82a0f51c4652adab51bc18bb92 SHA-256: 398c00dfaa36e6c9b20b6aa19b6f975a9d905b5b3419a10cf6f66e5226eef268
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://drafthe.ru/uplcv?utm_term=what+can+you+transfer+from+android+to+iphone PDF link annotation
    • https://avflash.nl/upload/files/satavororozuxutowi.pdfIn PDF document text
    • http://yongqingtech.com/d/files/83443352155.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/manimudu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f051a6f66---26157001467.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/lipitejogekakivujutemi.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/90934684239.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/guwonadavurotidipabobe.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/burepisokodegeletin.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zojuxisa.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jisuxoworiwanadip.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/dibirif.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/89118563650.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/51007406006.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/35438408540.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/73957584300.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091929342528.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/24880874136.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/vomofepezesosepu.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/61832230461.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914070311.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/bizejata.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/86556211945.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/sajowajeru.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/37594862514.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1a76ce36sn0373o4ikn6ojugmj/12246256296.pdfIn PDF document text
    • http://nature-revive.org/files/file/kubifix.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 17892 bytes
SHA-256: c2c532055e718aae8d68ecbd51244e374d3759dc5fbd62367360574ce1d26726
font_02_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 11044 bytes
SHA-256: 19e39e63af820c055dc13abfc1c790dbac344ec9a458dc3ad0be1aef0bd7a342