Malicious PDF — malware analysis report

Static analysis result for SHA-256 659eec371ceed9b7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 22:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7973cae0d80a5b143ca29d683235f58 SHA-1: b68fe53b2cad2cd9cded46c14331e2518ae874b8 SHA-256: 659eec371ceed9b719ab5dfa42288bd7328027f132745a6af77ca9f5ec31e8a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a strong intent to direct users to external, potentially malicious, websites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=words+starting+and+ending+with+a
    • https://softwebstar.com/shop/userfiles/file/3009102563.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/mivave.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/mepamuzumiwefabaxatexavo.pdf
    • http://wisdomtours.net/upload/file/91597582502.pdf
    • http://daiichihousing.net/uploads/news_file/76217640865.pdf
    • http://stringquartet.biz/web/images/fck/file/2709090673.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/fixasolirif.pdf
    • https://sabresources.com/FCKuploads/file/bizojepumujukefur.pdf
    • http://polaryachtmanufactory.com/res/wysiwyg/file/35078801620.pdf
    • https://lbk-ingatlan.hu/uploads/file/ludepagegelowokadutiloxul.pdf
    • http://artepcb.com/upload/files/serizevodabudisoma.pdf
    • https://lacausedeslivres.com/userfiles/file/siduvorazinodejumasutivi.pdf
    • http://thsport.dk/userfiles/file/voxirilit.pdf
    • https://aquafilling.com/userfiles/file/bojafomodokopirosenabegof.pdf
    • http://volvo-cars.jp/js/upload/files/tobofavudevepesilemevur.pdf
    • http://stauarchitetti.eu/userfiles/files/62045576929.pdf
    • https://dhesient.com/media/xojakodosotisoguwe.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/sudobujemaxiti.pdf
    • http://a-kamen.com/userfiles/file/25793939608.pdf
    • http://lsphc.com/userfiles/file///66057261188.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8aa.bin
9058fa79a0ed10bf4efb47d7e0a5ad48a7520bc7e878d9f248fd8d081650feb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10560 bytes
font_01_sfnt_off00010082.bin
428d441f080333db788f3ce0ec277f0e54d26a18d94f973eb2e0691aaae702fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 18440 bytes
font_02_sfnt_off000130c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 16792 bytes

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