Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdff2f54c160dd8…

MALICIOUS

PDF

81.4 KB Created: 2021-02-27 10:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4292e8fcb79c0d2afac4d669ae89a04d SHA-1: 281f0a414217b050729de6d8595532fddc014130 SHA-256: 7fdff2f54c160dd8f8f679708a65d959fe8c054e19cd3a6a9bca46eb6010c44a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a map, likely to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=map+of+maycomb+alabama In PDF document text
    • http://sejunirawor.22web.org/6199087565.pdfIn PDF document text
    • http://topekabur.iblogger.org/99681029744.pdfIn PDF document text
    • https://cdn.sqhk.co/xizaxulubezu/zWjhfig/maze_runner_movies.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/43538127695.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/black_ice_key_and_peele_transcript.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/jivuxo/gasizodaganejasokedaw.pdfIn PDF document text
    • http://fiwabafedazuv.epizy.com/african_cup_of_nations_2019_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/bilukomuseve.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/adobe_flash_player_11_standalone.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/fibujilimeduzamaxejarirap.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/best_free_autocad_viewer.pdfIn PDF document text
    • http://romisov.epizy.com/waxusuluvuvujesepumaro.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/happy_birthday_images_free_for_mobile.pdfIn PDF document text
    • http://kuwukazisopof.rf.gd/zadiwopisujizuzekanopabap.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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 5136 bytes
SHA-256: ff2c66c4b078e49fac4e11708e2a719a2bb533d437c7bd966b949973f0513a22
font_01_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 11136 bytes
SHA-256: db03b589f474d6e632855a77e82fc907d8d5ee388807e102724b58222b8c6cc3

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