Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e3208f4b17d55…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 07:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e76a29aabe279d91be1df7afdb93cfe SHA-1: d0eb56f536c24089c02e7d56386cac749deb64f8 SHA-256: 3e8e3208f4b17d55ab743811049f74c1f6de0fdb9fcb5ffc20e838110d7f00a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=android+web+games PDF link annotation
    • https://alev.az/userfiles/file/dapajalazadabud.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/29893486110.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/53585237205.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a612dd875---83785523543.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/32272789559.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f71fdf912---88218743715.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/jetive.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/25005315722.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/49170072641.pdfIn PDF document text
    • https://petek.biz/resimler/files/14765402000.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/vokibini.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/61094153851.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/tasafowad.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/25058012163.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sefos.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/fonukujatekafetav.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kowonojijotajojoxujifawo.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/70385901191.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-10/20210910091946262808.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/73027183827.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/furojegu.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_54806946BA40E3D3.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/gefadumexikosavumuzuk.pdfIn PDF document text
    • https://kiptep.ru/file/89687284697.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/biganasumiworafinusoju.pdfIn PDF document text
    • 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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10652 bytes
SHA-256: d2dbb42a7f94c17e99116bb9a2dc745ce0b38029c8491662a600678fc5cf9efc
font_02_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 17468 bytes
SHA-256: 775428c2a68efad2992d20de1545c6e9a3536e554361d8081f725d3c48fc0863

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