Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406d224832f876c…

MALICIOUS

PDF

79.0 KB Created: 2021-05-28 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 248346c69434add84351684e1e5a15b5 SHA-1: d45a19028dc37b174dadae029de0329ee7ce94d4 SHA-256: a406d224832f876c4ed79fe3b3be041236bbea16e2551fe5cca466ee79c0c194
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to potentially harmful content or engage in SEO spam. While no scripts were directly extracted, the presence of a link farm and the malicious verdict strongly indicate a phishing or malicious redirection attempt.

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://pelibifir.ru/123?utm_term=housefull+4+song+ringtone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447465/normal_60480d45b9968.pdfIn PDF document text
    • https://mujatasibofemi.weebly.com/uploads/1/3/5/9/135963028/moxorenuworuwukomemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60207b8274eb7.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/575ce14c9b1eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_604500985420d.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/wapuwujawalefazibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_6044ae799aef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6035c5370117f.pdfIn PDF document text
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/48ad0.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/nodef.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/084783328c7090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fd68ca162ceb.pdfIn PDF document text
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/44c5ebc7fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373998/normal_6000b1a6b111c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_6037b92088efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60195e6cbc990.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/xudugibafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_600a03b4d9437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_6009909da27fc.pdfIn PDF document text
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/8416089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_6051932243bb1.pdfIn PDF document text
    • https://jajelawipazug.weebly.com/uploads/1/3/0/7/130739535/takofapu_zupuwa_fanesomun.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_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 4776 bytes
SHA-256: 0efcbdadbc266798e1c48c828e2b10884b0d8a2f19e5077658becfc6d8f4dad4
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 10720 bytes
SHA-256: 8dd9da2fe4e0f1875ab973f83f4a5647784f7b02ae7745c3ae1dfed588ed336b