Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d2e7bed04fb184…

MALICIOUS

PDF

75.3 KB Created: 2021-06-05 02:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 484e02b522b87cea71337bfa6a8c38e9 SHA-1: 121a3566c63d1f59525e8471a7da9e0ca635c916 SHA-256: b2d2e7bed04fb18444e2b76c9f71f153a0cdaf1f9993f1b05498b22f70221b09
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://pixomot.ru/pbw?utm_term=como+cambiar+el+termostato+de+un+boiler PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426409/normal_5fdfc956091a9.pdfIn PDF document text
    • https://pafililesenuxag.weebly.com/uploads/1/3/5/9/135964876/04257fdd6f4fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_604149fd77897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_6012ea87394fa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4527859/normal_60b56769cb8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_605fb9caef95c.pdfIn PDF document text
    • https://resezavurafufok.weebly.com/uploads/1/3/1/4/131407395/f546c6bde6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_60479968cc6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5fda6f04f2c78.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/667c96a5-9f0b-4e00-a50a-89127b8b55fb/18026186271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0609de1d-ca14-46fc-9ba1-f6949dc0c9b4/chicco_nextfit_zip_convertible_car_seat_installation.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/test_answers_ashworth_college_electrician_reviews.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411489/how_to_move_an_elliptical_up_stairs.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144631047/lufekuzam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2134c1-8e1a-43c7-a675-d2335bd19498/maxi_dress_for_daytime_wedding_abroad.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144564171/slugterra_slug_it_out_2_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fde3d9-58d8-4217-ba3c-fb0c9e6fef20/stephen_king_first_novel_published.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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 5128 bytes
SHA-256: 090451f9f4e87a3e349397591db735c63f0ff5e9b0b28f07d5ae03290ebe258c
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 12948 bytes
SHA-256: f14c52789e381e7281619e37a0af8e0583f943326152879073777f636c055205

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