Malicious PDF — malware analysis report

Static analysis result for SHA-256 604fe12a5438e142…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 22:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d352f51bcff416bc181526c2787bfce SHA-1: 250eed3b4d0f5843cbb0c8289c255a139d2a23cf SHA-256: 604fe12a5438e14278cfbd3a36ee3a7cdf3357d8fd4863b87ef34a1f9824a2d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=popcorn+time+apk+download PDF link annotation
    • http://vindindex.nl/images/uploads/62674882765.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d20045d34b74a6fcf2b83bda0aa77770/24538364644.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/74113834323.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/14763598351.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/gapabofujifedo.pdfIn PDF document text
    • http://speedwayinfo.hu/uploads/file/wuzasamo.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/71845656768.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/74458807083.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/40436306925.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/vigeki.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/74065660715.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/39430666263.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jesorefegumafaloj.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/tosobom.pdfIn PDF document text
    • http://zimmerei-possert.at/5151555028.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/merat.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tuxifumubutelow.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gakuf.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/kikekowumuseweromajexures.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/nizagefekesuno.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/82807506399.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/43926397008.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/nexikefe.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/siwoluxuk.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/nebuwokutamalabujis.pdfIn PDF document text
    • https://uudanbury.life/files/file/likaji.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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 10684 bytes
SHA-256: 06c154e82780985b5501c4f9e3399b3aee4f3bda9fcfc313aa6dc01bf8cf9884
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 19780 bytes
SHA-256: 53b5aa10e5b13cfa1985ad4826989686997f38d3c43c4c673adbda8921adbb6e
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1