Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3e5e6ae6d7132c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 15:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b207a3918b298718a33c4f03bc80a79 SHA-1: 94977011d0c0d7352b0aec2aafc355c9e6088abf SHA-256: ab3e5e6ae6d7132cc539f1741d5f8d38fd1e38286fb7aa03cb905ad56b4fdd7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=do+i+have+to+play+pillars+of+eternity+1+before+2
    • http://falerisztika.hu/tmp/75525280517.pdf
    • http://ducnhua.com/upload/files/puroboxekep.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/zimubefimogazakugufuvivo.pdf
    • http://tageedesign.com/ssmpt/documents/file/89116324216.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/62462068617.pdf
    • https://ana-jsc.com/upload/files/19966472642.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/3786921846.pdf
    • https://madspot.dk/ckfinder/userfiles/files/lakebadanuselesixifota.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/35572196507.pdf
    • http://dodogs.ru/sites/default/files/file/30895816869.pdf
    • http://tykhchem.com/upload/files/3821837177.pdf
    • http://lighthouse-connection.at/myPix/file/27055684863.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210914114840_480882229.pdf
    • https://responsible-tourism-alliance.com/content_file/files/xedufuzutolugizaxe.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bdb8de052472f4c33b823e77e10b4017/27473758790.pdf
    • http://intimatehotelpattaya.com/image/upload/File/42099328022.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8a9fdbff5---72729816689.pdf
    • https://goodmix-psc.com/userfiles/files/97709571101.pdf
    • http://saikunghouse.hk/userfiles/sogilolovakibodebak.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/mematagusuvazom.pdf
    • http://imobilestore.de/userfiles/file/70780762327.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/18060790326.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6f.bin
70d1bb4a1c27e8277c8c1cf33965cd56f0b47fcdd640ecba6583ca7c9b03569b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 10948 bytes
font_01_sfnt_off0000d3a6.bin
4ad24c70e73c068fe7fdf4927b033a15341cdce78604742bf254605972fa7940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 18020 bytes
font_02_sfnt_off000101f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 16792 bytes

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