Malicious PDF — malware analysis report

Static analysis result for SHA-256 993f165203cde39c…

MALICIOUS

PDF

91.5 KB Created: 2021-09-17 18:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdda788c8a1868556524d1043f554cd4 SHA-1: ffa856876e233eb264f32b8cf855fe05d5d4283a SHA-256: 993f165203cde39ceca2131cd712ced16ea27101d1600a16764ab3eca430aee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's purpose is to redirect users through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cheumst.com/upload/fckeditor/file/dovesegesugajefijabi.pdf In PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/72700294782.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210917173255.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/pizuvofuwi.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091319324383.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/31168061551.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/68315214862.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/zemunoditenipofepaba.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/mifopudoz.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/77140534403.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/lazejimerodojenevo.pdfIn PDF document text
    • http://zgic.ru/!upload/files/61295354590.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/33206471591.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/90291349463.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090108001173499.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/musodasirojaxiweginufe.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6a8e0591f217560f4b1f2ffd3bbeeca6/razukoborijonu.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/45033390564.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/dubazarukudutepuxovumowub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373d283ff9b---74842077084.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/16285133657.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/36203984248.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/16234765271.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/womezifafozokobinotediw.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/53622006202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=alive+full+moviePDF 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_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 17228 bytes
SHA-256: 302878b8bb3240676f3032240b3d3fd3e87e8717711c9930cb62839e0e39d9ac
font_01_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A97 9888 bytes
SHA-256: cf2d907d1020002be4d100550adc1d0c48f0f3a1c986c169d5e5a748b2a0b43d