Malicious PDF — malware analysis report

Static analysis result for SHA-256 a963bebfab7d8dad…

MALICIOUS

PDF

69.1 KB Created: 2021-03-28 10:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4de22b2b016b22afb4aa3e4403221882 SHA-1: b54418bd3f08e88b3e7628a5bfce5a252fb39f61 SHA-256: a963bebfab7d8dade9d59c29024e8f767ed41e75182f96995b8a4605e7daa61f
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://jacksth.ru/wix?keyword=accentuate+the+negative+ace+answers+investigation+2 PDF link annotation
    • http://xedeporib.medianewsonline.com/what_is_chemistry_like_in_high_school.pdfIn PDF document text
    • http://unosital.space/why_lg_tv_blinkinglxzt1.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/tikojomaxafuzo.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/biodata_format_for_marriage_free_download_in_tamil.pdfIn PDF document text
    • http://2020coupons.info/nosowatagisaripizifwbwpl.pdfIn PDF document text
    • http://nuveclovet.xyz/xerox_workcentre_7835im5a74.pdfIn PDF document text
    • http://golixudib.mypressonline.com/heat_and_mass_transfer_fundamentals_and_applications_6th_edition.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/how_to_win_an_internet_argument.pdfIn PDF document text
    • http://leopards.space/184123838985h6g7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_6604969162d74caa80e8cea69104994f.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/princess_bride_movie_free_online_full.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_df59e2687d24407586fa4bc00267d382.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_5bf66812887943de823c47af1af658bc.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_b9a6e23a8ee04452b2d523a3a5221a77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73dfe91-6dcc-4188-9dba-e77383d41a83/pexolimus.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_8dbeeee5c2c448158df98067af34b10a.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/aasl_standards_framework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4714e19a-ffaa-4241-bd41-ec0fe62cde62/char_broil_infrared_smoker_manual.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_1f515640fb6b4ca2959bda11f4cf9418.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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 5300 bytes
SHA-256: 8d707866cb4c2182b747433a0cb7d7384007332033a86a0b3dd7fa690c2eb9e5
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 11568 bytes
SHA-256: 5a320855567a4447f7c9e09019f8c9ad5f52c15fe6167137bf23299ccf67d2fc

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