Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98fbd15a70d1f68…

MALICIOUS

PDF

85.5 KB Created: 2021-10-17 06:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 87c267dfa138cd857cd498d8551de76e SHA-1: 2ace4262b6146ef58d094c38b3bc16dfacb81875 SHA-256: d98fbd15a70d1f681020a9a3195ea3e99b415256a46cb1575a54c2e030398d0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of an embedded JavaScript stream indicates potential for malicious scripting, likely to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://papierplus.pl/userfiles/file/kovojapepigador.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/74605957317.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/mepixuxe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615317761b21b---10458369952.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/97537291148.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/13970753645.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kugafimofodowex.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/38217735027.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/dugox.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/watexu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/93983558560.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd36449f57---pezakorozixolote.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/99993764310.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/bivosuxitukelup.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/28854153645.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/32651457606.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/78751247115.pdfIn PDF document text
    • http://farmina.ru/uploads/files/gupudutex.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/62059217642.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/woxuselizenarena.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/81501328637.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ripiwotudabefigigogada.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/fopazojejateranopiga.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/37699202730.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ralebewabujodomijoboluxa.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/25182785129.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=software+engineering+life+cyclePDF 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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10620 bytes
SHA-256: a0e58106875e3248b16e86cac26cb01ec5b4459f263986cb0ab9d3044a0b6ff6
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 17908 bytes
SHA-256: e7abb987ad57f475b4df2c64104dd3e659a1d45849dd43d62130885b9fce4ac8
font_02_sfnt_off0001304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1