Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cf0243de3ecf5f…

MALICIOUS

PDF

85.6 KB Created: 2021-03-06 16:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7d26f5b8330cafc144edb34e25e8b2c8 SHA-1: 8479fb0a456c94dddfb07404273f10290843dcd5 SHA-256: e8cf0243de3ecf5f4f3f0c4f21c09a5f2669a96bde8bc74011d99049a975c055
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. One prominent URL, https://botokaw.ru/123?utm_term=the+wind+in+the+willows+1996+watch+online, is presented as content related to watching a movie, likely a lure to a phishing or malware site. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=the+wind+in+the+willows+1996+watch+online PDF link annotation
    • http://gugaferur.22web.org/informant_5_vs_google_calendar.pdfIn PDF document text
    • https://pojamemurix.weebly.com/uploads/1/3/1/4/131408024/rokimeged.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/busuzimotagafatubuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexejobi.rf.gd/48668067600.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_dfd1e3417730440286fb6edb75cbb8c9.pdf?index=trueIn PDF document text
    • http://tubujaj.epizy.com/jozajulunifaxumokuwudurag.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_b1ce11bbb3a1460788ff67735ccdc373.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukajevo/noti_flow_birthday_cake_video.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_b654ac89d236464dad7c038570111448.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_f70fa5fa998e4b03a74ec28b9ba7dda3.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_6ec6f525d5234eef87fc4285a07ea91c.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_e4f2463c29514d6785d42ec01ee217c0.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_f62896de8fb64e40837464d6b9227b03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/lujeluvogumig.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_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 5336 bytes
SHA-256: 3aba3ef704d5053c3b9a0af424f6915b974e3948c38b98d21e3be1bf3da619b1
font_01_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 11216 bytes
SHA-256: 2776faf6c44dec4cbda491ad197c32c20ebe52e4094fd8a529ef7baf62428777

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