Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8db40438321ea6…

MALICIOUS

PDF

99.6 KB Created: 2021-02-28 14:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd9d55c08d8ce4e78a529deee63a1485 SHA-1: 428adff2a391a2f256bdf60c99e3e6654a1dfd28 SHA-256: 0d8db40438321ea6e3f55efae71debf323bb32757fb884b528f1d6699bbd79c1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://pelibifir.ru/strik?utm_term=adobe+premiere+pro+cs6+software+price+in+india', is flagged as unknown reputation and is likely the primary malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=adobe+premiere+pro+cs6+software+price+in+india PDF link annotation
    • https://barutonujumajom.weebly.com/uploads/1/3/0/7/130739232/3420532.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/amazon_lord_of_the_rings_casting_call.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_60337f2ad1651.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/vizio_sound_bar_bluetooth_password.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488581/normal_60023fd7862dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5ff6b33dae72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6024119b355db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bioorganic_med_chem_letters_author_guidelines.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/20535960543.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/46286830004.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/harshness_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/brc_lpg_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/nelabigetofoxixufut.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/pebugitomotu.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000153b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153B6 25872 bytes
SHA-256: b4b16091ae6e5f8e8ad5be845fd135e1e67189ff7d653fdf5b131194579ea74b
font_00_sfnt_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 5644 bytes
SHA-256: 5e1ac00fafd79a2219b04394a9089be27a9f4eb8a65598e444abba7683a773d2
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 10680 bytes
SHA-256: 4d800c056f702a2e50e829d6f498214f5de62f50b929797c3af7eab96cc589a7

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