Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab815d8d6210ec4…

MALICIOUS

PDF

82.9 KB Created: 2021-03-13 13:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cdb6b8a73e710e37424e96877511df2e SHA-1: f9c6d414b3ab16f7b1f52ed7c54e5d6aa7679609 SHA-256: dab815d8d6210ec46cd51d86b4b240c7f800d2b783f68180ec1249a20500a78d
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 or trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains keywords related to 'Excel data analysis tool regression', indicating a lure to trick users into believing it is a legitimate tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/aws?utm_term=excel+data+analysis+tool+regression PDF link annotation
    • https://cdn.sqhk.co/peluxisomex/jKijjge/kopoxosomakapepadasu.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/gloomhaven_rulebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_5ff1ddc24ab14.pdfIn PDF document text
    • http://faruvob.iblogger.org/black_and_decker_circular_saw_blade_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/iisgjii/mudiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/bjbjdgh/scummvm_ios_13.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_to_clean_air_o_swiss_humidifier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_6041aca3b4801.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/0iitnEp/57857524711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lemujiv.epizy.com/cesar_franck_panis_angelicus_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/kixefamatis.pdfIn PDF document text
    • http://lasiliroba.epizy.com/pearson_nursing_diagnosis_handbook_11th_edition.pdfIn PDF document text
    • http://tilitun.epizy.com/42985482853.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/descargar_mediafre_er.pdfIn PDF document text
    • http://mujawonevafo.rf.gd/tafazetir.pdfIn PDF document text
    • http://kufawabizoz.rf.gd/43491418804.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 5020 bytes
SHA-256: 4bf2366e36dbf61ac966f6ca0ae27193f189d2427ec4be120c5a2577642e6456
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10576 bytes
SHA-256: e401b78d146a82827b52964bdf8bb2406dd177a6909652eaa504c06ca47f695c
font_02_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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