Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c425b7000c40046…

MALICIOUS

PDF

74.7 KB Created: 2021-04-05 12:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d66b187c14e6fc8f4489ffe6bf5f93fa SHA-1: f6f168b873ff54fd133bc3a286236ecc47dd2a92 SHA-256: 6c425b7000c40046edfd8328f4a5e00d8358d1b384a95b14257b4c1f2c840611
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to an 'entrance exam OMR sheet', aiming to trick users into clicking embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=jnv+entrance+exam+omr+sheet PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://qupieasy.online/dan_brown_origin_audiobook_free_download7d8bm.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/2435255.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/percy_jackson_and_the_lightning_thief_reading_level.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/jotobojilebi.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/90603468767.pdfIn PDF document text
    • http://marafonsport.site/lebozip3gcag.pdfIn PDF document text
    • http://jilet2.club/tanuwegedevukuwp9ev1.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/julius_caesar_play_act_1.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/02fe78.pdfIn PDF document text
    • http://revershjtb.site/dinajpur_education_board_ssc_marksheet_2019vqkbl.pdfIn PDF document text
    • http://xviiivbgz.com/walodixajulpiwh5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozupajekuledus.myartsonline.com/74113812405.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/bertolt_brecht_galileo_galilei.pdfIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/planos_arquitectonicos_acotados.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/sotapinigusezipazinofarur.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/65745178441.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/dewalt_cordless_tools_replacement_batteries.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/61752677939.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/62027181339.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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 5124 bytes
SHA-256: 54832ccd231c71c228d3f192e7ff539a0adf8705e17730842d15718107ed2c54
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 11296 bytes
SHA-256: e9b6254a3cf0fec2b709a947fd0ddcfba83e91d01a86f5afa3fdacd55b3bf55b

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