Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cc11d37ff2b41c…

MALICIOUS

PDF

76.6 KB Created: 2021-06-14 04:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 53bdfd650491dddeb34e07a10c736c08 SHA-1: c8316f7a920b72c9fc0d5033b6d476ff3428e914 SHA-256: 98cc11d37ff2b41c3eb00605399bc3697febf1cbc85ea044f34ae40c31977d72
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to deliver a second-stage payload or lead users to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=good+morning+photos++full+hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484835/normal_603f3817bff40.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/gajejeg.pdfIn PDF document text
    • https://bomirilipaxotez.weebly.com/uploads/1/3/4/0/134096722/9011597867a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5fee7110849d1.pdfIn PDF document text
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/6aee8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_60b9875b8cc36.pdfIn PDF document text
    • https://mojisavavuke.weebly.com/uploads/1/3/5/3/135312470/852082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_605b774930afe.pdfIn PDF document text
    • https://rovuxunezonode.weebly.com/uploads/1/3/4/4/134494657/zukal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_60559fcadc7e2.pdfIn PDF document text
    • https://rurasudi.weebly.com/uploads/1/3/4/4/134485231/3766494.pdfIn PDF document text
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/xojibad.pdfIn PDF document text
    • https://safodejinuvi.weebly.com/uploads/1/3/4/7/134753113/biwob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_6012a32c919b3.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/5086.pdfIn PDF document text
    • https://litudawugo.weebly.com/uploads/1/3/3/9/133997631/fd6387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5feef8e77900a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_603e1c92613a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_603951f3e4864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_60470d545c5c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144515502/8666068189.pdfIn PDF document text
    • http://tejuzedipebu.pbworks.com/f/47231256753.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_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 5276 bytes
SHA-256: 743b70b596029c5a4d70739b574b25acdcf67d39c6e03fe7b00ced61849aa9c7
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 11000 bytes
SHA-256: 6810c7c936870c76af01afdb62d2a4712bfa6a0b9205ab9ca965daba12ed296f