Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0063ba59b8a0b5…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 03:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcd0e29f3877e3ca67f2f575db2ffd47 SHA-1: 9f461395f3ab368a9eed630edfad21879aba7b50 SHA-256: 9b0063ba59b8a0b50a395ecbe7d67e728e2f65a4d9155066f2a48e3e2fc7b8b9
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 document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards malicious intent.

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://infrive.ru/uplcv?utm_term=kali+linux+ctf+blueprints+pdf PDF link annotation
    • https://weilaimachinery.com/userfiles/files/13222649909.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/18721683575.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/dukaluwa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9b786590---28007992988.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ninawebojetodugavovujevim.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210912_211939.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137520b9be36---kolam.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/linanalusevusowanasebub.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/97126569444.pdfIn PDF document text
    • http://chinazzjx.com/d/files/88263937944.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/5058251096.pdfIn PDF document text
    • http://hk-keber.de/images/file/81550357023.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908171900_033br3.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/83781677182.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/52248732762.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/37652308311.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/lamabukagukoparev.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/nikikufetovamum.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/mitazudiwasobufitaberobi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/taxebinemajigopilefomapo.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/rapuwosowudowafilimodul.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/manuroderagagud.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/66206870843.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 22068 bytes
SHA-256: 3180e39bbbae4ed64e3fb245bd9cbacb93607872dd99368a7cfc3c34962f3ee1
font_01_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 10828 bytes
SHA-256: e855baac4f5997dd681d07e3c0cd4ede032f5a78e1c3d8dc3d56d95b5bfac651

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