Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3212ac1472ba9c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 11:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69b54b91de0cd53b30a0fcd3653408a2 SHA-1: 71bbe7fd34e0913057ba0e9bfec8fa1e31be4da6 SHA-256: 5a3212ac1472ba9c58fb3acd4c731a4e502d849857b8115f13962fe9995617cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 potentially disposable domains, suggests a link farm or phishing lure. The PDF's structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://duszek-lasu.pl/userfiles/file/dozekufuxi.pdf In PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/tixodapalagonelovupu.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/bibega.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/fiparuxitanu.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/97911690210.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kogokejujijota.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f069976cff---13361311075.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/zilomunixifi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6f377e0b---50748312132.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/kisupexe.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/67336031004.pdfIn PDF document text
    • http://clerus.hu/files/file/23517039569.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/negedizadutidenokos.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910134316.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/sefela.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/7456740673.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tivugigokigitagul.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/32183609299.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razonuzojorowom.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/24159949036.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/35093350552.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fudimepoluxatewateze.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/tuwiwex.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/49966305653.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/71392041875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=super+iron+rope+hero+fighting+gangster+crimePDF 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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 17308 bytes
SHA-256: c91c6e929a58cd9b7f9be8fca698eddc5260c944731c39dcac0eaafbec0534d9
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 11056 bytes
SHA-256: 8ecfbc090eec685e3ee1d3e1a8cdedc3d4bf8d1e848899d8524a8cbf473d896f
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1