Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda4790044247673…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 20:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 658574d49e0579cd0e769a9635929cb3 SHA-1: b8d71336e9d653441c53bea7febc10d007885876 SHA-256: dda479004424767383cd4b3e9cf2d26fa53bec71a61814156f765b12ecc0c711
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ural-resyrs.ru/data/file/tijimosame.pdf In PDF document text
    • http://ottotech.center/userfiles/file/luwiviropulevukirudan.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613871ea826d2---38471031378.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/99372065026.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/zixiduguvalede.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/66393506980.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/ribebadetefenax.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nirepaxajibiwud.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/mozizusaro.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/betepewelixe.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/visofaribewiniputipe.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/99129213665.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f3fbc27a08c2dde5fd18202884cdc293/78190254914.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/84491131360.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/wonowifoli.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/83534733177.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/82079209919.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/likozusutakuwujutu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///38968302295.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/zevukugozozimusora.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/xokibobubexewugazut.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/47744454066.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/88480583577.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/18519990310.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/12337093454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aim+high+5+student+book+answer+keyPDF 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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 20548 bytes
SHA-256: 033bcd01a8f08288e679a553968b916335e307ce63bf1403b81e0d774ac7bfb2
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 11296 bytes
SHA-256: 38622c8410fcc066dc00d70e529c41ba46c7453d0df70cab89d02008152cbf5e

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