Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e23df48566801b…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 15:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e05dc83f25c90b0261bb402e0522ce19 SHA-1: e0a18232c440f91e1bb652e4624f60adbdd52d45 SHA-256: 27e23df48566801b4fb204be3ea1f2be05a6fcba05e3d8ea400739d9e9df1305
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm. This is strongly suggestive of SEO manipulation or a distribution point for malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://mezovuduw.ru/123?utm_term=is+light+good+death+note PDF link annotation
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/5802963.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/behringer_1202_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_601f77f3336c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5ffd704199c89.pdfIn PDF document text
    • https://ramilelajebow.weebly.com/uploads/1/3/4/6/134647205/kigaz.pdfIn PDF document text
    • http://converstarget.ru/farafixuzewapanak2l80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ff2136c96f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444864/normal_600bff515d402.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/2732281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_601d6af695d9d.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/8125184.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/7699743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd1c2a451c9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5fec7bf13208c.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/89219987276.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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 4928 bytes
SHA-256: 5d04d1f2916e54e932e2e808f389b3f45ce05a72f2facb0094c0e492b0783663
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 10436 bytes
SHA-256: e7eaf13d073930971b11b955efb9b4ab54f980ac5f41fecc23aa030ff7d201c3

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