Malicious PDF — malware analysis report

Static analysis result for SHA-256 2636fcabbc3b7ab7…

MALICIOUS

PDF

75.6 KB Created: 2021-02-22 19:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3a695185a60e97abf7d9f1fcb90b6cf5 SHA-1: 44802d994ed309fb43db706f1de092ae334d7567 SHA-256: 2636fcabbc3b7ab71d53b940bd80912b29700bf858ce73ba5dfa8ea878a31c86
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL (`https://jacksth.ru/strik?utm_term=political+science+books+to+read+for+beginners`) being identified as a potential redirector. The document body, though heavily obfuscated, suggests a lure related to 'political science books'. The presence of multiple disposable domains and link farm characteristics further indicate malicious intent.

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
  • 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/strik?utm_term=political+science+books+to+read+for+beginners PDF link annotation
    • http://gallery-shop.site/60030551536t95d.pdfIn PDF document text
    • http://reabook.online/1st_year_biology_notes_free_downloadveybm.pdfIn PDF document text
    • http://micrometer25bill.site/771777660542wrch.pdfIn PDF document text
    • http://jotewelife.iblogger.org/88178621792.pdfIn PDF document text
    • http://myfirstsite.xyz/kemowosisosadidejufuvoput6br0u.pdfIn PDF document text
    • http://trenketo.buzz/selenium_webdriver_recipes_in_cbf201.pdfIn PDF document text
    • http://zesamoa.online/wekusopafcprcz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://delixerilebuk.epizy.com/47814351634.pdfIn PDF document text
    • http://dojomasamolazib.epizy.com/tefezexopitikufe.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/atari_2600_emulator_games.pdfIn PDF document text
    • http://xegilejefaga.epizy.com/zasativosowavaf.pdfIn PDF document text
    • http://susejukeb.epizy.com/xumuwiragorokowakuted.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/iron_maiden_rime_of_the_ancient_mariner_lyrics_meaning.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/epictetus_discourses_quotes.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 5396 bytes
SHA-256: 4d39a7efe972cb41b980eaa0f3394eced008b3291f13527c25239b45a9ad01da
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10216 bytes
SHA-256: 96f37cdec5d1db187674cea52edbd7e35abe4947e142490ef410bcdc99c49f33

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