Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d74c2c6465d198…

MALICIOUS

PDF

71.5 KB Created: 2021-02-21 17:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 926ccffd656af88569ac20f43fb3d4c0 SHA-1: d6f947f3e5f01391a9dea5e0b09138457c3ede2a SHA-256: 50d74c2c6465d198dcb508156219ee6b005df87b7432b5be818ab33923a9d127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a large number of external links, indicating a link farm strategy, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/aws?utm_term=que+es+artesanalmente PDF link annotation
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/4c3f5a.pdfIn PDF document text
    • http://skidki-day.site/murray_mower_deck_pulleykb1fp.pdfIn PDF document text
    • http://yourcy.com/exhibition_stall_design_portfolioluzht.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/kezixodekexebirudu.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/dixole.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/nibuku-gidizebuvureda-suromuz.pdfIn PDF document text
    • http://itanto.space/mibuzogexoserezg8zb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/hangover_2_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/english_to_marathi_translation_online.pdfIn PDF document text
    • http://zudavowopo.epizy.com/adana_agreement_1998.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/free_8th_grade_physical_science_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/product_warranty_certificate_format_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/casio_projector_xj-_v1.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/iphone_tracker_app_for_android.pdfIn PDF document text
    • http://kunivoji.epizy.com/cydia_ios_10._3._3.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/8540496580.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/firefox_app_location.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 4892 bytes
SHA-256: 65edb73e5c994716831e2e92167a533077a296bcfca0365b1618a4fb0a588753
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10812 bytes
SHA-256: 863510d5c8bd26341322db7ead6f294f69b6facb049e9c414c0bc2f850769de4

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