Malicious PDF — malware analysis report

Static analysis result for SHA-256 747660055b1105d4…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 13:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad9e4a467413c240d644485e2959a95b SHA-1: c56be68c00bc3bdf41003804f77c4992f3c36cc7 SHA-256: 747660055b1105d4b787f22129fd41e40e2c86efe88df279e698c71730d8700f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains numerous embedded URLs, many of which point to potentially disposable domains, and triggers a 'link farm' heuristic. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007. The primary attack pattern appears to be luring users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dierenwinkelindex.nl/images/uploads/mujibetubaduw.pdf In PDF document text
    • https://nordavril.com/userfiles/file/xurinemuxodofatofabafow.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94072640475.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/7840497148.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/68581616704.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/757838221.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/23025893382.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/72176525284.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/95888566249.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xikukovolawofalasu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/lakapukafibagakimapewigo.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/10622920505.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/34066528722.pdfIn PDF document text
    • http://klinok-saintp.ru/files/92884277558.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///26194473645.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/8655549796130d1372b543.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/rolomamojamovuleroxa.pdfIn PDF document text
    • http://strahyi.ru/images/file/wudumulu.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/8165516562.pdfIn PDF document text
    • http://geraldinekilkelly.ie/roremarenopufutikofalumaz.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vowuputerosapupezeve.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/fukatitikepivenizuwewa.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/40082227346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mustang+gt+v8PDF 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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 19228 bytes
SHA-256: a8708264f1199ef974b40cd82bca5a69c146e23335e3bb9c5c5951d8202d66d1
font_01_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 10160 bytes
SHA-256: 7768b81f45a79581679829c37ba27d016eb73e662d6f0e473b1dd4206c7e6e3e

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