Malicious PDF — malware analysis report

Static analysis result for SHA-256 909f13c99768c10c…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 08:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 229e02c078e6611a762ac96fd4ddca5e SHA-1: 239ae740f8b2ad5414e4b2e1bce04965ef079386 SHA-256: 909f13c99768c10c26b5b88ff2df76c0f0b9538434d983eccabf4d13b6b7162c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristics identified the PDF as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the detection signatures point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ferrocom-spb.ru/userfiles/files/nusimesufikes.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567f7b477c6---fopevagevenisik.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/anme5cidm1eha572b5voqnb060/muxolus.pdfIn PDF document text
    • http://indianamartialartsfitness.com/flash/indianamartialartsfitness.com/file/rifomojuwelip.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/47947423498.pdfIn PDF document text
    • https://dogodanang.vn/uploads/image/files/66726116630.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/67310204317.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/tawezevenojiwudew.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/semoxudofujonutenedok.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/41620849761.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/jevujavufamorisuni.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/33514992283.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/fatopofef.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/97555747119.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/dizewizomoneneperuxeg.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gabimogafikejupe.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/36054244247.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210921_B2C23931AA2431C9.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/satuwot.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/xomatolutejukobojali.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/98126120289.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/14755300080.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/51890659667.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/67758189183.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/xuwejol.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/56459882392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=trade+in+tagalogPDF 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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 16012 bytes
SHA-256: 07c9137ac6a469ee959676db11cd0cf72095bfadd676a31f0380c1f376fa7860
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10216 bytes
SHA-256: d9c9e252f8cffc47bfceaea30ecd2992698346e7156dd6dcbc019400cabfbf03
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1