Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57b8c66c9795ac0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-24 23:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b1c29cfdaa3ffab8c7d30466a959138 SHA-1: bd17059d30653f60fa3c08f6082716d8e6b2e310 SHA-256: c57b8c66c9795ac073bb38771c12740467083c510718e1dc3a16b47686994fc9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple distinct PDF files hosted on disposable domains points towards an attempt to obscure the ultimate malicious destination.

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://helder-effect.nl/userfiles/file/votisu.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wuvapoxijemo.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/vopopadeg.pdfIn PDF document text
    • http://citra.cl/userfiles/file/litumuv.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/24819156830.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/97103296059.pdfIn PDF document text
    • http://kechengchem.com/upload/files/38912063357.pdfIn PDF document text
    • https://linardi.ru/files/file/fepazusasipet.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210923032031.pdfIn PDF document text
    • http://czyxchem.com/upload/files/weruzimabimegezijawibi.pdfIn PDF document text
    • http://freeorden.com/media/file/32751868588.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/58131443294.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/rujigamanuge.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/15632690098.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/wumen.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/1996602685.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109181523328708.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fubemi.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xetufudi.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/49593242309.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/sidofibanusekijuxanod.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bec76b42b---99842198481.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/xuwisajawofamoga.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/88001770123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=camera+view+androidPDF 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_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 10280 bytes
SHA-256: 89af26f8326958fd999f2259eed2b0740e40382833605103850bd77ed48797f6
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 20980 bytes
SHA-256: 9f1a6b19eaf317e65c03a60346f5b94494c3177c6908c7e22be85d421f8d4f1f
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.