Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8831fd506f0e9ce…

MALICIOUS

PDF

85.6 KB Created: 2021-09-22 21:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c11dbdfe194bdf66cb74cfeba224394a SHA-1: 52b06946df302f0bc58f84210e97c73994ff29ca SHA-256: b8831fd506f0e9cea97b9fb015c969ba1dc7c105c3c59236050ea6e5352484ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://oniceh.ru/uplcv?utm_term=webasto+thermo+test+android PDF link annotation
    • https://yukkumpulgroup2.com/contents/files/91030031669.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210921103148445245.pdfIn PDF document text
    • http://i-dron.cz/data/file/91741911424.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/49507393910.pdfIn PDF document text
    • http://keyday.ru/files/files/buzunuzexifatiwazaxu.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/47931556599.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/pukazelobapazokuzazede.pdfIn PDF document text
    • http://compsult.net/userfiles/file/moleromet.pdfIn PDF document text
    • http://yanartextil.com/firma/files/17507466440.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/87079027449.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/15629682749.pdfIn PDF document text
    • http://jsdarvin.com/files/kejesomujuluzagesogezuxi.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/63847966348.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/50186029633.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410db40d397---67276998333.pdfIn PDF document text
    • https://ever-progress.com/upload/files/jimobenixaji.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/6087009119.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/sujapefurebi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/49c99b89a68cfd89bd52eb5770e6afe0/femosulodakutunupe.pdfIn PDF document text
    • http://ty-int.com/files/files/51712396320.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/muvuvidaxero.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/depepakaveso.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 20896 bytes
SHA-256: e9e13120435dc6ee84f156ec0f364ad14ae65f0ed1c910a4ee9198c809ca322f
font_03_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 10600 bytes
SHA-256: b39b72a4c8d298478fcfdbff50ad1fcdfab651dc0e269f6518bcb5814a112afd

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