Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0257d728f99aec…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 22:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0b4e11aa88bf32efd9cc00cf04fd71d6 SHA-1: 04cba838ce186f8a0696cda47b344e8d224a518c SHA-256: 3f0257d728f99aec52ec7578196ef02a942889443e07feb3e866b1d95a604cdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=coc+top+up+gems PDF link annotation
    • http://hmsendo.pl/uploads/editor/file/79446532752.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/sodotadevuwepol.pdfIn PDF document text
    • https://unaizahic.com/Files/files/35493872300.pdfIn PDF document text
    • http://asqcert.net/files/files/gebigogav.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136146714f5f---futifazigagataxava.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee4600374---jetipefawob.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/82039543197.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/46790043897.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kavob.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/97541762432.pdfIn PDF document text
    • http://gibisch.biz/files/files/83224134624.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/fujinedelagole.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210903025535.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/90339677899.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/dobemabepiniz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/56989882719.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/zabamagisu.pdfIn PDF document text
    • http://sjhtractor.com/d/files/93031054196.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/gupaburubesag.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jovanokusibefefexalajezu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/sekarekuso.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zusokitenojamu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 10344 bytes
SHA-256: dcd8be910b2c31a2168d0505b5f243502761e9b2fe7b4a2859586d08fa57102c
font_02_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 17508 bytes
SHA-256: fb05c662c9d749181b854be55bdde7d0a279fb5c892959b3e570812a1755886f

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