Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a50b6a499f3317…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da0b94240df253459e0e45799d6392a2 SHA-1: 658391987e2f7e3eafd55746612bdec377b11561 SHA-256: f7a50b6a499f3317bbe16307632f9f5dcea1581b5e85803c25bcea8a7035d6cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

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://anctools.com/ckfinder/userfiles/files/nubage.pdf In PDF document text
    • https://dom-titan.rs/files/93173320976.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/pixuteveziz.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/fizegezo.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/45233379474.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143342f9f9e9---jivapus.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/mizowedilajizeri.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/desoromomuwanemolut.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/77251449578.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/32646416535.pdfIn PDF document text
    • http://zaiger.ru/img/file/65194862940.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/75894880005.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/konijotukegojabofefu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/49659176939.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/wudoxekevober.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/78093101379.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/naresonirugajujiluxomix.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/kasapufenekufepoluzapuxa.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/4546078774.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/junagurufukawilezimimam.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/75718139717.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/rizezo.pdfIn PDF document text
    • https://premium-house.uz/images/file/lurerununi.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/moluwopaseretud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+add+email+to+my+android+phonePDF 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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10680 bytes
SHA-256: 2d24c1a54d57d0e9bdb61d7c72b019f5177756a180819a97978a637eeb127324
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 17620 bytes
SHA-256: 340ed808f61b893c89829f65b33b85a6a3fddd9ddccf48f46c7ac15a4f330229

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