Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df06a81659419f0…

MALICIOUS

PDF

44.2 KB Created: 2020-11-09 08:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f7fdedf4805954128e5a3aa0df2a163f SHA-1: 989520302f63b948a8dcb9c489fb617d76a8418c SHA-256: 1df06a81659419f0b0912cd4b29ae427076570e71c89d79d2631eecf013d32a7
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains a lure related to changing HP computer passwords, directing users to a URL that is part of a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a brand-impersonation credential phishing attempt. The document body itself contains obfuscated text and a URL that appears to be a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/829a5c1d3.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?keyword=change+password+hp+computer+with+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5f96a4486ef6c.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/829a5c1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5f966c7474dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f9bc48a5a45f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f9653c58aee3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vivader.files.wordpress.com/2020/11/nuzoge.pdfIn PDF document text
    • https://xojomome.files.wordpress.com/2020/11/falilobugokerujoxale.pdfIn PDF document text
    • https://xokidat.files.wordpress.com/2020/11/automotive_service_inspection_maintenance_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c93c5a9-69f8-4807-b5ff-afc23333176e/drops_in_the_bucket_answer_key_level_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41b3d3d-adb3-41e5-b073-ddc236822f77/herbert_family_guy_soundboard.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/high_school_for_environmental_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05225a7e-5603-45fd-88bd-82b32ba78a62/duxexixivekusuzuk.pdfIn PDF document text
    • https://wisevojinu.files.wordpress.com/2020/11/lababazagijoxixexelufogal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e715e8cc-684e-457d-8bb4-79951cf1ad9a/83331844368.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_off00006b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B09 5644 bytes
SHA-256: 5118aed47271d4a5be4e784f225f5ba2df7e00da683cff422ff3de756a416e83
font_01_sfnt_off00007e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E26 10928 bytes
SHA-256: 577ddedbc9593a0c0d3798efe6a57131f363ab91056b2bb6d0c27a6f1ff4fa03

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