Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f3be07890db27…

MALICIOUS

PDF

97.1 KB Created: 2021-09-11 06:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cebd2e865d6492678cef62af9cbf1434 SHA-1: a8ff84f1ba52407da019ed5b1c8be03e495eaa32 SHA-256: c84f3be07890db2744d542714408a73b9884a19f5ba1347e4ab8f0e78f7c3714
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, 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 for phishing or distributing further malware. The PDF structure itself is exploited, likely through embedded JavaScript, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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=3gp+mobile+movies+bollywood+2019 PDF link annotation
    • http://mwflower.com/upimagesfile///30945360248.pdfIn PDF document text
    • https://dyaa.club/uploads/file/mebajinupuzemutikojuv.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/bezokuxovimofujin.pdfIn PDF document text
    • http://enricobarraco.com/files/dobijokivo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ueurn0qj74df15pkm91pdu2s3/47157123050.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/bowimifu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6k05a7hmr0r6dd6hoco256r3h2/dinabi.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/rutenazekarojugerejuj.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wizozezamama.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/redunevijubokuvazetefiliw.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/peboxemaram.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/vedijapapuzirokidozo.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/mifafomova.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/watig.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/50107266976.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/47989405990.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fepotijojugopabimim.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/zuvobo.pdfIn PDF document text
    • https://j26clean.com/upload/files/jutejuregimabiwe.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/74542621133.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/febepolenuvaresunopesu.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/13659203784.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/26844961468.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/81007823182.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/75547257009.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_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 11216 bytes
SHA-256: 5767d4e0b4bb5c3e71df845fe7b18f3775b9ef20d77a01f1db1410123bd48ea9
font_01_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 20112 bytes
SHA-256: 359be950dd023d77e83bb166dfd2f5fc489f46edfd704950e7b2a45f8b73c17c
font_02_sfnt_off00015e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1