Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa4b6296d1f12e6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 06:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d058d35a18f90202dc1d11aab74cf61 SHA-1: a553079b9ef6f0b24848eafa4c97ac1c978a4152 SHA-256: 7aa4b6296d1f12e6f24542797cc326d6999ea8db73c9ce3e7963a1fba5f8207e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links indicate a likely intent to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=arc+length+formula+calculus+calculator PDF link annotation
    • https://careersourcechipola.com/files/public/42328290059.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/2658014354.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/sipojewinuxisarukunawuba.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/72465030499.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/38415860152.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/modorepekelojigidibeketow.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/fexuso.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/69036362670.pdfIn PDF document text
    • http://minerva-collection.net/files/files/xadikelamusanavus.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c9bf70b9c705ac65d862d3aed6a7c6d1/gepebupesogelovu.pdfIn PDF document text
    • http://screen.by/images/file/10778749530.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/43692682279.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/99198515645.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/nonawusoxujivij.pdfIn PDF document text
    • http://wernitznigg.at/files/59477921421.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/ragisukebor.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/fojopegekedatelitel.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/ponitadosoleba.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/11955920436.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f0e3e912d---19792720537.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sijijatogepofanexizigi.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/91711896058.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_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 10772 bytes
SHA-256: cb569b1da8a55d27f1c5472a8102c38238c85b5ee30cc90fe6680ce8382feda1
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 18064 bytes
SHA-256: 24d5002dc7eb58d2b704968d7dfd53798f153ffc254d0fed443ae1b5d0798793
font_02_sfnt_off00013eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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