Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aa1f96da955f1e…

MALICIOUS

PDF

79.9 KB Created: 2021-03-28 20:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c90099e858e81b973cd74a1ba70571d9 SHA-1: 5ac35a578c795531e9982d79168219ef768a06df SHA-256: c1aa1f96da955f1e8dfca089c06f16ada5f8cc66b008afdb9d99ffe562464c84
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 0.9998

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://baarspo.ru/award?keyword=admin+manager+roles+and+responsibilities+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5fdd77112477f.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/gvrnPhg/battle_rivals_moba_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_6033ecbae47ed.pdfIn PDF document text
    • https://wovitinukid.weebly.com/uploads/1/3/4/3/134372120/70c30a9c2.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/3IU7fBe/dog_tennis_ball_launcher_machine.pdfIn PDF document text
    • http://meletemobu.iblogger.org/sea_animals_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/jcZhc8r/dialysis_technician_training.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/igcihqd/jemavadafanofulamulaweli.pdfIn PDF document text
    • http://wagezofon.iblogger.org/146993125.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/ajcaihp/coursera_algorithms_part_1_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fdc521f40fad.pdfIn PDF document text
    • https://tegedibinatamam.weebly.com/uploads/1/3/5/3/135350324/sugatibawesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_28c06ef5e1144c0b940175ecd9bfccb7.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_73fd26c492a649978e43cc72305b9e68.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_58821c75c1024b5397f0ec60d33c1742.pdf?index=trueIn PDF document text
    • http://lavodusepigixu.rf.gd/gao_wasteful_spending_report.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_4d3e583abd2e4dfe80c7625cfe4307c9.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_e747b3466f3a4e80a97373f37893fb55.pdf?index=trueIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_f379a874487b4f05b2d92c1745d2940a.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_bd9176f3713749a6ac4ecd9f9eec3ead.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_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 5492 bytes
SHA-256: 71580883f1664bf75fb0c7d62c4b10efc7e433dcafb27a5c273f941435fac157
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 10932 bytes
SHA-256: 7b0626df28e88cf0280a8717449dd5021f04a65561f097cd36e3e4f7d0836630

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