Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ce79a8ff61adc2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 15:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1dca4f872b5d7e21f4a0f69fb7d647ce SHA-1: d100b53dea4eb0c9d1749c1cfabd64e80f7d196c SHA-256: 97ce79a8ff61adc29e3f10c9fb8f719921c48488760fb9925597dc4801fe7ce2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a probable attempt to redirect users to malicious websites. The presence of external URIs and the link farm heuristic strongly suggest an attack pattern focused on directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=sites+to+watch+harry+potter+for+free PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dcb4576563506a5509c23f1b78621c2c/39325183090.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/puwizotisetobijiverinopu.pdfIn PDF document text
    • http://fpole.ru/sadm_files/16005892238.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/16725150899.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/zanefotugofizikufifi.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/jupitunomiti.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050513357633.pdfIn PDF document text
    • http://datcat.vn/2018/file/92013410474.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • http://dhf-china.com/d/files/33266760147.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/96751232120.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/fezunegapozikodomezebizuw.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/28144155827.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/88904882976.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f635b52f08---15056673886.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/tirub.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/maguzumogaze.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/guzal.pdfIn PDF document text
    • https://novsport.com/content/File/jilesutezebupexotaviku.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/kaxelotobuxipinovume.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/jivaragi.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/tupoxafegetega.pdfIn PDF document text
    • https://coluer.ir/documents/file/18488104576.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/55932881229.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dutizaxet.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 18172 bytes
SHA-256: f0086ad2cd0bae8ad0dbdc47a2780af0cc75b728e4cc1194e5833877f52c492a
font_02_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 10704 bytes
SHA-256: 9563c718a27f68a57235e592c5e000158374527c4ee4d40b4616f14ca7a42fd5