Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72e77a9940bed8…

MALICIOUS

PDF

92.5 KB Created: 2021-06-05 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 023558af760608d8251f8038969c1165 SHA-1: 473bc3f0344d257b5e9223d01ca5fa8cb43a8186 SHA-256: bc72e77a9940bed8b465db28cfd108c2e7f25db05103977240c2380c52bc4f88
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links pointing to various domains, primarily hosted on Weebly. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/pbw?utm_term=what+does+the+house+represent+in+a+rose+for+emily PDF link annotation
    • https://vufodasab.weebly.com/uploads/1/3/4/6/134639116/godarotu-webobe-pidumodi-sarajojesi.pdfIn PDF document text
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/0c0e23b1b3.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/dexosagubo.pdfIn PDF document text
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/bb96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_604e26bdc0eb8.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/c9225fd3cd448f.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/vejonisujap-natetamubew-voduxe.pdfIn PDF document text
    • https://xefolulewonud.weebly.com/uploads/1/3/1/4/131406676/961eba872b7601.pdfIn PDF document text
    • https://xevujovi.weebly.com/uploads/1/3/7/5/137516820/8916399.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/1270376.pdfIn PDF document text
    • https://kexofoxofoxo.weebly.com/uploads/1/3/5/3/135318322/gimuwafexisiva.pdfIn PDF document text
    • https://teduminerat.weebly.com/uploads/1/3/4/6/134665194/rebezipipapagev-xodunup-sufuxosojenutaj-resumemefaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6056c2b5716dc.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/02ac168a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_606af65a292a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_606a3aa98d269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6057023a4c483.pdfIn PDF document text
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/kosuzabo_pemumifif_terel.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/eff71031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e621b65-dd01-4c22-9cae-3d63a80d1385/28286940601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55114fcd-234e-4a6a-8412-eb53da48e3a0/nawakejonipapesigatavojut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a2581d-e0d3-4be0-94b4-5d9c5cfc3649/buxovitelelewodig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82500015-5ff0-4204-b2dd-dee5dbfe6fa0/71348411472.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_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 5396 bytes
SHA-256: d0f67087bc0af7a618afb7e279436b0ed4fe6ffccc913fd882cf743fe9e530c4
font_01_sfnt_off00013dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 11340 bytes
SHA-256: 155215a5462ecc548cfa1170e55136383211b8fe7c95fcc912c6b41b1eeaf02e