Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd5f5290492cf6…

MALICIOUS

PDF

71.7 KB Created: 2021-03-21 22:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1efe0d737aaae7d45b1a9f94fb7f998c SHA-1: 5d762b84fb466ced36c1548df1ca6a028278fec1 SHA-256: 19fd5f5290492cf6efa996ab66dea73722fbc5cec3ebacc49370ac4f538d8c75
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 0.9991

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://nipisod.ru/award?keyword=profit+and+loss+appropriation+account+format+pdf PDF link annotation
    • http://lifeeuro.info/xurenuvekibeme77bm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6022c4fcdf1cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fc736f5a3f95.pdfIn PDF document text
    • http://hookup681.site/80375456620hxdro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5fd87c244f130.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/Njgieb9/entergy_phone_number_port_arthur_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/SjaVDic/gnuplot_line_color_key.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ihUZgjV/58578319007.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/fithdha/bamesixixukumimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464715/normal_6001696c7e161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fc985b2227be.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/Gk2iajc/85019266612.pdfIn PDF document text
    • http://libertinemodels.com/32273839003fain7.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/0d4c2f18-c9a2-462c-a681-3dc0849c77bc/rodrick_rules_door_sticker.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_6d333e1b06e24284b51b62c618990bbd.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_f9f16f30bcf54eecaada2dd3fcc4fc9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd13158-084f-44b7-97e0-56275de88d9d/essay_on_the_effect_of_covid_19_on_nigeria_economy.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_872ebe00c8044506955425f55a084770.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_ed6b4612b58748dea6825dd622ca8fd6.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_af3b723e86d3413d921086aaf84bf218.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_4a0d9f96ce7a40a684303881c983418a.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_de1917edb9234de1bfa531da74c09f00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/354d33af-b207-4444-8ec5-f3bb6e8fb98f/64484821583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c657745-34a4-4bc9-91ce-ddc20fda5a64/where_are_humminbird_depth_finders_made.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_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 5300 bytes
SHA-256: e76bef0e3d44c7b94f899c514760f08e4a122cf538bc5f8e098d14496d085f34
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 11528 bytes
SHA-256: bd57a6d3bdac0e599dc3905f28ebf49ad8c337f83376956b499e1fbe1a10f194

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