Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c76136770a81ed…

MALICIOUS

PDF

80.9 KB Created: 2021-10-12 12:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a68d57cb49ef1c21dda7e15d0e9fd97b SHA-1: 61dd4440a98aef604d5f12d74eee58fa2de084fc SHA-256: 67c76136770a81edbbad84a5e5834ff5e96031e8b0a6a4af5ff2a7596e809968
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://centrons.com/uploaded/file/1567677676163fb2912ed1.pdf In PDF document text
    • https://marblobaths.ph/app/webroot/img/files/vamabajigerifotopena.pdfIn PDF document text
    • http://stpogfzz.com/attachments/202110/editor/file/zadalanurifirudi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8ad3432f---584177036.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135d253aea78---30145169198.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/joxekezoxunakafal.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/runizopuroxofemug.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/10809894030.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/26375790660.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/46019236259.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/senifobinaraxumoli.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/12370690697.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/47939079554.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/sifakitaxagasetebuzapeg.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/99191659918.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/31737657350.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/58593161421.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/losabugupazogawojad.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/7583162672.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/selolojuvilaxiwobuwiwupo.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/35527953515.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1633544020908631487.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/xipoxajejefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=steph+curry+3+pointers+in+a+rowPDF 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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 18748 bytes
SHA-256: 5068dc6ddcb4f438ef2061e8a18a9133181ef30ccbac8e890132e8b6aa4d8664
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10972 bytes
SHA-256: 33fe4d2f33ca5a4af508926d686420c2556f19301b53b2fab9661d580d508840
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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