Malicious PDF — malware analysis report

Static analysis result for SHA-256 5994dd62ec171659…

MALICIOUS

PDF

78.7 KB Created: 2021-05-28 20:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59df757034360b896410c6527b2d8154 SHA-1: 94a5cd19390a2701f1aa104286ed0bec3cc63d5e SHA-256: 5994dd62ec17165923e325719dcc1edc397c35e0b9f4c382900eabe0a591ef20
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 0.9997

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/123?utm_term=kansas+city+news+reporters PDF link annotation
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/8e9a94df787.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/9974627.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/19020.pdfIn PDF document text
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/3878156.pdfIn PDF document text
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/3629768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456989/normal_60070685ae9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fcbb4a0a9b8f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468289/normal_60b0a0d734ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5fe820615200f.pdfIn PDF document text
    • https://xomixosusanit.weebly.com/uploads/1/3/1/4/131438267/tifojegimuruwuxojuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_605f5537a71f7.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/zivalafojagakudafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_6006a2b3e156a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601ab3d8e0fb8.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/gejaw-xupag-zomisarate.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/pinov_favavelozovari_domus.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/7978561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fecc4a0f3581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_60161686bd7c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_600a9dd18e9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6037f49e13499.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_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 5056 bytes
SHA-256: e9a86e78273ac73bf5c6309bb6a260d9407895cc17ea17a293194542e9c45f5d
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 11456 bytes
SHA-256: 3c00d9690e63bd6beed08457b11ff421f0d336f92f1c89cd9fd43a0301636e17