Malicious PDF — malware analysis report

Static analysis result for SHA-256 b169cdf67820b292…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 08:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62a7a10bd3d7eedc8427eb174d610484 SHA-1: 219695e619127d3bbfeae5c7ddaaae22eb2d52ee SHA-256: b169cdf67820b292abceb0017d5b28dab28cd437aa8d01e636bdc04b5cb92092
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. The document acts as a link farm, directing users to numerous disposable domains, likely to host further malicious content or phishing pages. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading or accessing harmful files under the guise of legitimate document submission.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://wastran.ru/uplcv?utm_term=email+body+for+sending+cv PDF link annotation
    • https://mai-avto.ru/upload_files/file/domujuwogevinunogami.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/49344281720.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161359026a1038---sasanunok.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/dagalemonijazure.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/51990040166.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090712550279.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/nekodo.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/tumigoxixejoneserisuvifi.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/69038044033.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/xozebarojam.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613657406b987---zokeva.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/79719186267.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mewugevomikopebizi.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jipojosapo.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/zufixotudi.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/80885832168.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/26911482512.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/sedakujivimetizejawul.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/88071897170.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jepolapegevowavefejagi.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/roworujesudesili.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/35525084785.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/90653139460.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/sinede.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/xijizug.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/63419400928.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 19608 bytes
SHA-256: 656ae7dfde915be5b30260f205291df530f4071d673c5affe85ac4602f27a157
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 11024 bytes
SHA-256: 40c2ec54c1f07f1b07fee469e6fbb04641dc5c8f53fcc534a47945beecd86f1f
font_02_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1