Malicious PDF — malware analysis report

Static analysis result for SHA-256 838bddc5da315cd4…

MALICIOUS

PDF

148.6 KB Created: 2021-02-15 03:28:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e47cf7797cbd8c5febf2333bd2b3f65d SHA-1: e32071bb0a4d085882f1477f5d9928d7f9e659ec SHA-256: 838bddc5da315cd45f83bdcfa5d8f7c279a1da28edfe40c4b796f6983e2032b2
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. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jacksth.ru') that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a search result or file download lure, aligning with phishing or malware distribution tactics. No scripts were extracted, but the overall structure and URL usage indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wb?keyword=alter%20ego%20a1%20s PDF link annotation
    • https://cdn.sqhk.co/tabakotodi/SiiLjjv/amazon_surgical_face_masks_made_in_usa.pdfIn PDF document text
    • http://50offshop.pro/file_manager_app_download_for_pcq4s6i.pdfIn PDF document text
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/ganolimaniv-gulepodev-gafiminimafuwi-debiwox.pdfIn PDF document text
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/lemes.pdfIn PDF document text
    • http://winoraama.space/13998440357zckby.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/6979477.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/58473e235d.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/78732.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/dEicBjh/download_turbo_car_racing_3d_mod_unlimited_money.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/3105de3a.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/iijh8ja/69198164081.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/ajh5ghc/sunixuvigelixijuvu.pdfIn PDF document text
    • http://winsl.space/65118050373sylq1.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/lusabifef/macbook_pro_buying_guide_macrumors.pdfIn PDF document text
    • http://tejutavufoxif.epizy.com/peveborifobimube.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/nudol.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/unreal_marketplace_submission_guidelines.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/aicc_full_form_in_education.pdfIn PDF document text
    • http://todinig.rf.gd/wasot.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
    • 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_off0001f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F176 5556 bytes
SHA-256: 1cf55a72368e0b005fa913f7b20bc86bc4023c433100cd698daf1740491ea089
font_01_sfnt_off0002049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2049D 12544 bytes
SHA-256: 48bed8ba9410f6ed39bd9fa6ef6ad69f34989f1847daecd1f2f1ea6176313381
font_02_sfnt_off00022d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D2C 16284 bytes
SHA-256: 730fc328d9325e95574748a9424e19ce1bf2481faa408955f419eb589684c9ff

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