Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec2556ca02935f4…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 09:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e5577efdcb0c4494744f2a4e9a59125 SHA-1: b3c333e1bc2e6d9e3d281170e94737179892b627 SHA-256: dec2556ca02935f415daa1092a6247464c94e993cf28109b8f7615168e2c5588
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results for various topics, including books. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support its malicious nature. The primary intent appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=don+quijote+castellano+antiguo+pdf
    • http://vebilodugisugod.iblogger.org/what_is_a_operating_system_hardware.pdf
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fc9f72108cd3.pdf
    • http://tevopose.66ghz.com/11958747186.pdf
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fd6465881788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daniwodug/delta_flight_attendant_salary_2020.pdf
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_1f16c657b48747c9a3211f0e3415a939.pdf?index=true
    • http://mofebuxigonewo.epizy.com/bumoruteponafejaxofi.pdf
    • https://s3.amazonaws.com/golepe/11045132024.pdf
    • https://uploads.strikinglycdn.com/files/a920935d-1fc5-4d0f-bfc5-d53895173856/50_shades_of_gray_streaming_partner_in_india.pdf
    • https://uploads.strikinglycdn.com/files/0462393f-9c8e-4bde-a3d6-4928f490675b/rangers_apprentice_the_royal_ranger_book_1.pdf
    • https://uploads.strikinglycdn.com/files/9c2f84a1-a042-42ce-8a12-53dcefedb050/storm_giants_thunder_review.pdf
    • https://uploads.strikinglycdn.com/files/9351e7f3-86ac-483b-b74b-ea13d2669ff0/mopebujewoxebepukaxowozo.pdf
    • http://dipusoxitiruvu.rf.gd/nuzesunivikitififotugoxi.pdf
    • https://uploads.strikinglycdn.com/files/149462e7-d1ee-43c9-9188-c3b0ad7ea488/6844107274.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_0adeb654fcd14d388e0dfbb025d54dcb.pdf?index=true
    • https://s3.amazonaws.com/vanatul/jelly_roll_pillowcase_pattern.pdf
    • https://uploads.strikinglycdn.com/files/9f0bcff1-a754-4bb8-9418-17c91e4ea789/wolf_of_wall_street_quotes_wallpaper_hd.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d0.bin
b26e0badc3dcfa9f9dff2b2ea259904c00c0e52880b6d9e1c01db34f71aeda76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5428 bytes
font_01_sfnt_off0000fc63.bin
598e3153ee11d31733c59361af9d900905be1d3b0d1253fcacc9d7bf377dfd9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 12068 bytes

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