Malicious PDF — malware analysis report

Static analysis result for SHA-256 f322e831ea307750…

MALICIOUS

PDF

84.5 KB Created: 2021-05-28 19:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 59bfb98ed74b700aaa98bdf1665d70a0 SHA-1: 57d7c28f7215e49188290629f825f17fcd9c51fe SHA-256: f322e831ea3077504c258c1662b65d8edcb926d4d0b48cb759da6e6dd24d6dbf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm or a phishing campaign designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=holiday+affair+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409623/normal_6017212794ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffbdf5c17fa2.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/fawosamuzifujiz_ziravas_bomapawiro_futubekit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_6040712db49be.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/xumidedevidu.pdfIn PDF document text
    • https://zogujajuzeve.weebly.com/uploads/1/3/5/3/135392671/064e51fc.pdfIn PDF document text
    • https://nisofopirumo.weebly.com/uploads/1/3/4/4/134478351/2679143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_601722cac3b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fd0d5f8b4de5.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/verinapajiba-dotif-siperegelit-likineresi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fd1731bdac09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_601eebbbc2600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475992/normal_6001816840816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd27274ec3c2.pdfIn PDF document text
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/javojumomi_tukevawutumita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_6049b7f6491cf.pdfIn PDF document text
    • https://kizegugiruliti.weebly.com/uploads/1/3/4/7/134729255/c7770122f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_6028e5883ef13.pdfIn PDF document text
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/kesinuvatupovofenag.pdfIn PDF document text
    • https://vuvitujenus.weebly.com/uploads/1/3/4/3/134305132/diguvudejod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423171/normal_6003e995e247b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fcb394bd1021.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/wosobanisadoxa.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_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 5000 bytes
SHA-256: 8e154eb9811d5cd9d4707eff5e9e15623572bc567fd8bea648d1f1bb9f73740d
font_01_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 11184 bytes
SHA-256: 8bf84bbbaa6388f6c23bed4b3e343213b4dcb82af5ec882e88a21012dde1d3e9