Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa80b8f384d2e75e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 14:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fef0af1945075ddf6a2fe2038e312f88 SHA-1: 18ace287dc138679ff770c97950d6620470c904f SHA-256: fa80b8f384d2e75e5f3bde58d57da3ae8777ed7a73380c9e356dbfd741b251b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=3+ninjas+knuckle+up+full+movie+online+free PDF link annotation
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/rititilido.pdfIn PDF document text
    • https://adikkedua.com/contents/files/kegatemodufamasatebavew.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/66661860696.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/varitutafi.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dafubitapamenojo.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/41402194992.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/34403313769.pdfIn PDF document text
    • http://thedreams.cz/files/jopopabupunisob.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/remijogeninelupifisoparaf.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/ruludubux.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/wabagiposudegixu.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/mokivewolole.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/68266185455.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/11764099906.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/firim.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/bafenokujebitu.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/kifufopibowomatifet.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/73940693022.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/36mlg0p99h9dk5056e0ifi5uio/49354302805.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/96421622483.pdfIn PDF document text
    • https://haidangpc.com/contents/files/vebifolagukobuwasokiru.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/givibarugasujona.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mamogiteji.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 11004 bytes
SHA-256: fd36bce448c17aee39edb7998cb2d628584504730bbbe7f9008a984e26b62b4e
font_02_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 15672 bytes
SHA-256: 06b53f26cedb53be6f234cd728b7b7fda88521420ef7652e2954a5a1605de91b

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