Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0de6165dea4026…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 14:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aae01553075547b6224905809cee0264 SHA-1: a6ba3e4f1f0b796bfb2d8f6ffd25dff4341df1d3 SHA-256: 4f0de6165dea4026a25c976cd8b1fce85ba03685e694b73654a078c2561cef7f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'English grammar exercises a2 pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?utm_term=english+grammar+exercises+a2+pdf PDF link annotation
    • https://cdn.sqhk.co/mezutowede/igchdJn/super_sonic_the_hedgehog_theme_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60586d440497a.pdfIn PDF document text
    • http://ita-talia.fun/dog_man_book_10_plotm8ac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_60562d45e05e0.pdfIn PDF document text
    • https://cdn.sqhk.co/muwomixerom/hk0J3XG/15860167663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fce6d4c6a9ec.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/pigj1Qu/39284521137.pdfIn PDF document text
    • http://tibetterrier.ru/xazebutodedoxigqn30t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd27737a7635.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/edrfKhc/34345580008.pdfIn PDF document text
    • https://cdn.sqhk.co/raratajuxu/96gjc8Y/57345219966.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/toliwudalamem/black_and_decker_jigsaw_blades_for_plastic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e8b819-7888-44d7-b56e-528b8574815e/siwumunuwumizexazizun.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/bidufigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f014716-bea3-44b9-9475-2764bde78967/20622915152.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/chasing_cars_spanish_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0503ced-42ab-46c1-a656-8dfe17852723/2484742622.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_ae06d4ecbef14febabe8df1e1e461cf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7e5e21-e3f6-41a6-a35a-5411ae417402/utilitech_sump_pump_1_2_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/ps4_bruteforce_save_data.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_54c163af0b8a49a3beda0313f62ecd65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/nerasesizajomilubobil.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5724 bytes
SHA-256: 668eefa10ac16e48438a7f7d76da99109ed350bf09cc1de645d7c39547a6beed
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 11184 bytes
SHA-256: bfc8a572326849292eb5cc41bd47e01848c5671e7582b9ef7c9df42a4288e9eb
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16508 bytes
SHA-256: c27f923d842fcf75914bcb38f910c7ee9e5e847eea41e4b8197fd3b1a7c12a35