Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b6c054f57107f2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 03:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3133f29b487e19be7a2ef7451ff6c1c6 SHA-1: 0b3cb85fabb75fcc25921a56a1b97d89561644f8 SHA-256: 87b6c054f57107f26f8b69419be1ce58b72023b3f102542090fdff0bbd877410
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme leveraging a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=id3+tag+editor+apk PDF link annotation
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/78357271087.pdfIn PDF document text
    • https://e-midas.ro/files/file/58409520288.pdfIn PDF document text
    • http://honda-vo.com/upload/file/kapovavifa.pdfIn PDF document text
    • http://wdnederland.nl/file/bajojitipojixurikuga.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/wojolad.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/kuvoburakepobojo.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/luvotikaviri.pdfIn PDF document text
    • https://alkoplast.rs/files/20982957781.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/58986432350.pdfIn PDF document text
    • http://acril.ru/ufiles/files/54155869150.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/75551142818.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/59088815853.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/xewirokupopogexi.pdfIn PDF document text
    • http://licausi.it/userfiles/files/majerukenewew.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/14626501375.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/voveduwunovazokinigibure.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/likagerome.pdfIn PDF document text
    • https://ienter.bg/files/83680846692.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/17728077532.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/63084612103.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/mapafumogilivejoje.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/rutakewelivusaxig.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/45487125461.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_off0000ad6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6C 10464 bytes
SHA-256: 8066c37102f3229478a2f162b2aa7b60029593f796df5740916c8ccf97af29b0
font_01_sfnt_off0000c51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51C 16100 bytes
SHA-256: aec67ba7f03abf0ef1b470f5d304b6eeb20038d965ccf077c17d6f98400721cd
font_02_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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