Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d90722b51b0e74…

MALICIOUS

PDF

111.8 KB Created: 2021-03-04 18:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9c2c66c162a095f9e03454dec35e4451 SHA-1: 46548953870ae67a434bd7041de83cf362cc3ef5 SHA-256: 70d90722b51b0e743afdb1cb7ed72eacc22e0004f4badc17939750b665213527
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a phishing lure. The document body, though heavily obfuscated, contains text related to a study guide, which is likely a pretext to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=electricity+and+magnetism+study+guide+6th+grade PDF link annotation
    • http://pinopizo.sportsontheweb.net/jivijimumosope.pdfIn PDF document text
    • http://torevifij.iblogger.org/sanelafufifij.pdfIn PDF document text
    • http://lotto-investclub.com/mipefonojebug1wxr.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/noco_genius_gb40_wont_charge.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/49007947735.pdfIn PDF document text
    • http://prostosite.site/personalised_birthday_book_adultspl01g.pdfIn PDF document text
    • http://rozivoladavabog.iblogger.org/webisozezopezoxixe.pdfIn PDF document text
    • http://meriline.store/light_her_firez3quk.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/fasofoxigatafis.pdfIn PDF document text
    • http://4escam-bot.online/fotizowekovizekag3060.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/jonora/b._ed_scholarship_form_online_2019.pdfIn PDF document text
    • http://moroxite.epizy.com/pugezez.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/melissa_a._schilling_strategic_management_of_technological_innovation_5th_edition_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/62753532765.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/62950800319.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/59370699332.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/5649485706.pdfIn PDF document text
    • http://merojupamen.epizy.com/zufazilapimuvaretogew.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018069.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18069 25500 bytes
SHA-256: ca03850cb056ead3ce79b989fa9aa9c9f64c71aa23d22e9726fadf37f34f98b9
font_00_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 3388 bytes
SHA-256: a1f202cf560f5bb0ce8ea6c238aefca0902074053983aa5ef9b79c795ab71d24
font_01_sfnt_off00013837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13837 5564 bytes
SHA-256: 9672f30b7707dbbc4dfbb59a4cdbb90f2fba3b94b5c8940e6e3be6af6c385981
font_02_sfnt_off00014b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B06 15756 bytes
SHA-256: 359fb8aa72ff262785818775153bbcff53f14a92924c55e9c71efffe63a7184a

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