Malicious PDF — malware analysis report

Static analysis result for SHA-256 89403721d17fdc6d…

MALICIOUS

PDF

132.6 KB Created: 2021-02-18 12:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8c2979cd8ff1418fb2c7f5075534ea25 SHA-1: 518758de54b9539e6b867dfdb15172fa9c96c0dd SHA-256: 89403721d17fdc6daa5cf8714ec8c0b94109e8aa4450bae40f1861c396ed9e20
186 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 0.9998

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 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.
  • 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://seumenha.ru/aws?utm_term=vishnu+sahasranamam+english PDF link annotation
    • https://cdn.sqhk.co/leredupodeka/gcaNjfB/vijolipaja.pdfIn PDF document text
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/148dd970.pdfIn PDF document text
    • http://natiral.space/38208420654gi89l.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzefoke/dNVhge5/bovegoxujudere.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/hk5j7T1/fogozarizejejonodemer.pdfIn PDF document text
    • https://tatujudipopef.weebly.com/uploads/1/3/4/6/134605081/wurobelibipegoxijid.pdfIn PDF document text
    • https://zovamegazojuji.weebly.com/uploads/1/3/4/8/134849063/e3cb7c3a0.pdfIn PDF document text
    • http://giocodigital.fun/xaregupesanezvoym.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/Rhjihgg/togusegirifari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fee71728c481.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/igLiahg/8864418241.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/44634831475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fee6dcc34ea8.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/4jdDojb/grand_theft_auto_v_ifruit_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4789eda7.pdfIn PDF document text
    • https://cdn.sqhk.co/gupukutolet/Bchf38i/rock_of_destruction_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D07A 5064 bytes
SHA-256: 56761a84d010f082eacb3851fcfb2bb19971458bdb81ee835a050a0877cd168e
font_01_sfnt_off0001e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E18C 10944 bytes
SHA-256: c183157ac2e60be0ebfa055cb2e435a928c7cc94fc9764186912e51cf03c93b9