Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89fdcff6524fdeb…

MALICIOUS

PDF

63.4 KB Created: 2021-11-13 03:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5efe8123d79ec6cd99ced948bbf4ae4b SHA-1: dec7c538e754f3b04060ee2c507eba9e3eec2c7a SHA-256: d89fdcff6524fdeb4243955a0ea29b8e71d7a3370c8f5b5167d1128e64445c41
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 within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and the numerous unknown URLs suggest a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bifruit.mk/ckfinder/userfiles/files/jebefesalip.pdf In PDF document text
    • http://matsonconstruction.net/userfiles/file/148593627.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/34677022798.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/64546444120.pdfIn PDF document text
    • http://scalper.ir/data/files/file/58806559483.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/wusomuzada.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/50503197644.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/33679938732.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905141246.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/22798189782.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/pijenivupunewazuraka.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/viluxotovazejab.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/it288h77hb2p0ptluhkddnk27r/falugasufefigosijivuwadi.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/84505477876.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/zaxujemugaxal.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/labiburexug.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210926190855.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/93445381205.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/95112114736.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/14469346802.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=how+to+get+pregnant+fast+after+30PDF 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_off00009622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9622 16368 bytes
SHA-256: 682f8aac15e3317cf077b18d17a8ef683457687e494960d62ac7575211bb93ea
font_01_sfnt_off0000c035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC035 10768 bytes
SHA-256: 2b57950d937ea56a805ffb3f65a14960cd5fb6696ae2b5455abd6b5936cfc346
font_02_sfnt_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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