Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa28baa3145a133…

MALICIOUS

PDF

77.0 KB Created: 2021-02-15 04:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1e5bbd049d5b59ac36775c52bd3a4a89 SHA-1: ca4f1a9533b98671b5b6c58e179bfdac8e472cb3 SHA-256: caa28baa3145a1337a102d67f3e4385eb80a656f5a8a589f742a9b83be28e5e5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=skam+season+2+episode+4 PDF link annotation
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/c40ac8c2504.pdfIn PDF document text
    • http://sanadewa.iblogger.org/bccic_annual_report.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/ragexoxarodopubenara.pdfIn PDF document text
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/zizivugozelokaf.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/naming_organic_compounds_with_functional_groups_worksheet.pdfIn PDF document text
    • https://junetinovifadi.weebly.com/uploads/1/3/0/9/130968968/77ce58.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/1391301.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/xewifupadoliku_xebosez.pdfIn PDF document text
    • https://daxixerok.weebly.com/uploads/1/3/4/0/134000062/guburi.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/girilifawuxi/lajavebaxiti.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/vivaxepogirumosu.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/83308494938.pdfIn PDF document text
    • http://tefabawamibane.epizy.com/naruto_shippuden_senki_final_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/43405281882.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/kewol.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/zodaxevalinekajorinem.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/fijenutofeb.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/cercospora_beticola.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/theeran_video_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/betezexibodadurowo.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 5364 bytes
SHA-256: fc8031942f40f7f353124878ab12a72e519ed1dfcfd5393f787739a671c95474
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 11092 bytes
SHA-256: bcf718ef56708362160814100078e6a28c7fbae8c2a7291592c3ca7e4d06ba16

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