Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e699727532f8667…

MALICIOUS

PDF

82.2 KB Created: 2020-11-26 07:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c42166d8ae0644404719a61c80688afe SHA-1: 948112a674913819bc85959a0e5df5c9b68254db SHA-256: 1e699727532f8667dc526a328a5464a8c2bc3eae8ca2167b997f5e9613ae2b5e
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xapinetevum.weebly.com/uploads/1/3/4/3/134330578/7c1cae788f59fbe.pdf.
  • 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://trafffe.ru/strik?utm_term=castle+over+the+hill PDF link annotation
    • https://xapinetevum.weebly.com/uploads/1/3/4/3/134330578/7c1cae788f59fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f8c24fcc6711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5f98ef86a96d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_5fbd29a7767b9.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/bitenusimuwimenoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_5fa5bcc153721.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/wokokagegegaxopefus.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/5a00a.pdfIn PDF document text
    • https://getosadosaponup.weebly.com/uploads/1/3/4/6/134697390/jofexujopajaj.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/e94f0b34-9b72-418e-b99a-9327e122d550/59459849047.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/roblox_sheet_music_tale_as_old_as_time.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 4736 bytes
SHA-256: 7c0b86dc55377e61e552e921259cf29f0a001913119e8fed95484025c5c50e40
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 14676 bytes
SHA-256: 776b4e3095e4a1514f700d6357491bc40b73320c87a70b83ef18b25868f39f98
font_02_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 6128 bytes
SHA-256: 7b4eb8d14f29588e3896155be438c9309611e47e3fec554f92fc966acd51ce8e

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