Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b2f262e5d3e86…

MALICIOUS

PDF

84.4 KB Created: 2021-03-25 06:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8849896a2ca0d16969067d85589e29e SHA-1: a941543a0ca4d4bed09a8cba66bfa2ac7baa4874 SHA-256: 8f4b2f262e5d3e86f6670b1faebed9ebe89bf1845334c8b4975c2d6a1097c3c0
186 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. 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 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://resalured.ru/123?utm_term=blue+eyes+video+song++hd+mp4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5ff6ae8eae7d5.pdfIn PDF document text
    • http://dorightunion.com/afterburner_game_pcqbfmi.pdfIn PDF document text
    • https://xisagoruno.weebly.com/uploads/1/3/5/3/135332800/5011098.pdfIn PDF document text
    • https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/677640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdf46eb910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5feafa50aa0b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6021301c41c4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_6033320119f8d.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/0157b4.pdfIn PDF document text
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/8807475.pdfIn PDF document text
    • http://teaitalis.space/43577145669mpz40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_5fdbb592c72fd.pdfIn PDF document text
    • https://webesamogamafi.weebly.com/uploads/1/3/4/0/134012635/2488299.pdfIn PDF document text
    • http://xtrading.buzz/how_to_make_a_line_graph_in_excel_with_one_set_of_datag0bg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebejos/biggest_difference_between_android_and_iphone.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_8da3d99f17214abb87df54001dd503f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezux/2427734386.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_7a6f2ce324934f718e74b46642a27e2e.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_2f774eef02034b499401af8e0caa8599.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_aa7bda1bc270415bb1f82d34eb7b904f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/86526033522.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_96bdc5aeab974398a2c853c776de7c33.pdf?index=trueIn 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_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 5368 bytes
SHA-256: b4bca627b01a7584cc68466c7d2e84c0251f73400ca37b7ae76e14a74a9e3656
font_01_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 11028 bytes
SHA-256: 6876b9dcd7ca72c3c30c6a774cfd9fdf008ce41e166ec51fbe350672284a1d78

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