Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf98434ac3a8cc…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 15:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6e4ad09ec1b5461e87a2b10d621e3dc4 SHA-1: 9f9f8275adbd3067fc50f0f5891b421c72a84b92 SHA-256: d6bf98434ac3a8ccca9ddf40d1c99615a1e73c12ad4fafb7d8b395b481280949
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 0.9996

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://pelibifir.ru/wix?keyword=fear+the+walking+dead+pilot+episode PDF link annotation
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/pamubununi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408711/normal_5fe4421f3cf85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490757/normal_5fc8dcd2031da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_600ccdf45e0e5.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/LSCojhP/sijifijokakatukugat.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/jigwz7I/world_conqueror_3_ww2_strategy_games.pdfIn PDF document text
    • http://klossheff.xyz/sezadalasalusosuzebivumhhus5.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/bY4gjij/98369521003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494160/normal_5fcea16bd1afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_6045f5578b1bb.pdfIn PDF document text
    • http://dkshlyap.ru/ant_video_er_for_firefox_ubuntu6h1c8.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/VLwggjl/video_browser_downloader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fd9dcc3f221c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6022e0181f84b.pdfIn PDF document text
    • http://mrshadow.net/simple_business_plan_example_for_coffee_shopc1ycx.pdfIn PDF document text
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/tasoruku.pdfIn PDF document text
    • http://reawolt.online/98680497895x6tza.pdfIn PDF document text
    • http://openlait.pro/the_amulet_of_samarkand_audiobook_free_downloaddii1q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_602aaf2a95c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_60488708ea588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_600bf97cbfaec.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/jelabej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 5332 bytes
SHA-256: e8efc95aa27fc9858b4a5d2c375aa4df6efa15a1d6622d3205b96d846b5342c8
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 11196 bytes
SHA-256: 0e4bee82c005fff33af495e7964d474641a9ee6266c569ccf60af126bce916cc

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