Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d168500f21ccd2…

MALICIOUS

PDF

89.7 KB Created: 2021-09-09 07:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a2edcfff3d22c428fc2ed2063efe373 SHA-1: beecf192f43ff1acba7d29e454b61a24fa584f40 SHA-256: 96d168500f21ccd2a553caf77aa26bd69beaace0bc75acacaa29b8f25908c8be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score strongly indicate malicious intent, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://fueandhair.com/userfiles/files/bowaza.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c21a9b4083f3cb1562064f483c3ab96a/38315941996.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/darijuwaf.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/24825703502.pdfIn PDF document text
    • http://hingliltd.com/userfiles/jemosokazozigiferive.pdfIn PDF document text
    • http://hkacca.com/userfiles/purobijelum.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/18369200025.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/17999460520.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f0edcaee---11988694079.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902135452.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/57333158348.pdfIn PDF document text
    • https://petek.biz/resimler/files/fuvenujumimazod.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kogabamamas.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nivokejodovugafugumi.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/fenimub.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/kiperunenax.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/dedinilesavufofurixaxiv.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/68211433965.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/noxigarivuri.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/96930143639.pdfIn PDF document text
    • http://gibisch.info/files/files/69489289459.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/22771267511.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/pedagoxabunivewulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+ios+hacksPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10272 bytes
SHA-256: 57bb85ce23078d268b5b58be1ad173b319b3a565a028d2907da7db06358b5f51
font_01_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 19024 bytes
SHA-256: 04fe52da98cf396f48d4658109245ac6e99e09c2bb91951ca052628f5d736b67

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