Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ea4364410fd79…

MALICIOUS

PDF

73.5 KB Created: 2021-02-12 17:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8eefe1104ae626562da5a680fe7e25d SHA-1: 948c7d823ac56d69429191a0ad67997188a43cd2 SHA-256: a43ea4364410fd797bc32fc31f100c512a9313c7d61ef4a7276c0298e56fb72e
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://leonvi.ru/wix?keyword=8+ball+pool+cheat+long+line+apk PDF link annotation
    • http://raifaisentgo.online/rorinivofozex92inp.pdfIn PDF document text
    • https://zupabigawobal.weebly.com/uploads/1/3/4/3/134326688/badodizakarokevaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fd7c6ab7e3e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fc81aed566fc.pdfIn PDF document text
    • https://guxitodek.weebly.com/uploads/1/3/1/6/131637279/rasozexivedas-fojarokef-zujebuke-zefizeman.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446638/normal_5ffcfa5a5f333.pdfIn PDF document text
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/254189.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/jhI0Aif/79994414254.pdfIn PDF document text
    • http://domainlimax.xyz/batman_1989_4kyhlra.pdfIn PDF document text
    • http://autoupgrade.website/ravens_depth_chart_2016yndax.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/balizaxi.pdfIn PDF document text
    • http://trujillostacoshop.com/29907663436qarvt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fe2d417032f4.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/UXYExw5/party_music_video_download_mp4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazutun/cartoon_kiss_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/vamoka.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/anger_of_stick_5_mod_apk_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5012 bytes
SHA-256: 1a55ecfae18a9ba5e0c6c351826b43f834d8ae6ae59988a983e5468a8fc0368f
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 10308 bytes
SHA-256: 73f481a794a8273f93ab611c5eb7a0be3b97e9a16fc1cc6749e2433a5fb557b9
font_02_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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