Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8e5339c2d41fcd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 06:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9aa4564bbde8872012db68e68511ead SHA-1: d49d39675a6efc430210ecdb66634b4ce663c5c5 SHA-256: 4a8e5339c2d41fcd65497486ef125fcce5c72e5b79f42c76d4e09c5c9d9f1a6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=everland+android+game
    • http://teresachild.com/upload/files/dikutaruwexis.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac86e5b3ea---welesapijiwuzugivewitebu.pdf
    • http://fszhenjia.com/upfolder/e/files/20210914081842.pdf
    • http://dooroc.com/tk/upload/file/75485681321.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/dafoxeti.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/nejedifobidigaradoku.pdf
    • http://rooptex.com/uploads/96227179607.pdf
    • http://luijkzonwering.nl/image/file/kuponuzom.pdf
    • https://centrorevisionimonregalese.it/file/8767824600.pdf
    • https://3drm.bg/uploads/pictures/files/27212108499.pdf
    • http://shopcode.ru/uploads/file/wejolufivigodilumu.pdf
    • http://studiotecnicomartani.eu/userfiles/files/29033838970.pdf
    • http://bebelino.ru/userfiles/file/vazekadegupoxizopofo.pdf
    • http://kunjipsc.com/uploads/files/verilexaxip.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12984469754.pdf
    • http://tomdythai.com/userfiles/files/taliwitabepudulanirinegi.pdf
    • http://101eyewear.com/luutru/files/86823188150.pdf
    • https://frenstravel.com/assets/ckfinder/userfiles/files/tepolitarovizodipobowobo.pdf
    • https://marcvandewiele.com/userfiles/file/ketanefobova.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xadirazokomut.pdf
    • http://www.keizerco.nl/userFiles/file/37630650518.pdf
    • http://blackhorsesc.pl/userfiles/file/mebotiravure.pdf
    • http://www.almansori-ye.com/almansorifiles/files/36551050071.pdf
    • http://morebricks.com/ckfinder/userfiles/files/bupesidelut.pdf
    • http://okmarin.ru/userfiles/file/80629879265.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000e632.bin
d6021efa2428b352b02bc2ff4c0121cf4efcf6e0fa0a9c7db9a65ca52e09954d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 10376 bytes
font_01_sfnt_off0000fd54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 16792 bytes
font_02_sfnt_off00011566.bin
174edca452c5120df9393455f35dad6fbcf2456387b5b42d81dc6b5fcaf36d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 16644 bytes

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