Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3ca380d031797f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 05:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aca0dd31b5ba10fd6818ba7755ca2eca SHA-1: 8d1049b585d5215155f7ca791f5847e303b08ed6 SHA-256: 8b3ca380d031797f9165522980e8c567b34cb0192ed77bb70cc5d2c0bfa30584
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://movie2book.com/userfiles/file/rusarifabuxasugobuzobilam.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e9bc4fce---82621961877.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topokageva.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/48113144177.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/duzejegedutatapokud.pdfIn PDF document text
    • https://viceda.com/userfiles/file/dufiza.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/jogaziladivosalefa.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/rujoxabike.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/22937475278.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/44596050242.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5bnrru0b57umqisdbn59h15mfq/miraginuxabutemidiwefaxo.pdfIn PDF document text
    • https://edusfera.pl/upload/file/xidodawenaliwejapago.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/66137416947.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210907062706.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/9470531571.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/66447485047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+underline+in+textview+androidPDF 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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 10680 bytes
SHA-256: 2d0d0ddfae06bf63a4b0c649ce4bad8c0d1dea5739adf0e13ee238711321d4f2
font_01_sfnt_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 16332 bytes
SHA-256: 22f644dc0920fb6325c3d1a8d5296c7c7e4ca0733faaaa11af37e3ac6eb90399
font_02_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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