Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8bdffcb8566d69…

MALICIOUS

PDF

76.0 KB Created: 2021-03-27 23:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 10c55343c84d6f71cdc181f6f5c4d73d SHA-1: 5a65d0c1f0c933b16c5f45c4f53bb26f45a7a582 SHA-256: 9c8bdffcb8566d692667c7e93ad501c39d973a46157630c64fc8cad0bea0bcf0
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+use+everstart+maxx+jump+starter+k05+manual PDF link annotation
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/memejuzodal_mujupavununalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_6003e1b923012.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/muxinez.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/samsung_xpress_c460fw_install_toner.pdfIn PDF document text
    • http://dizuvunadideja.22web.org/26008959265.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/jpg_to_online_merger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_602fd8ec0fa00.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/64646675297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_5fde754f98944.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/5910347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_1dca0f37b5e1473d95f9368e1bb26dbe.pdf?index=trueIn PDF document text
    • http://zefukasuwowejev.epizy.com/baofeng_uv-_5re_manual.pdfIn PDF document text
    • http://widusop.atwebpages.com/32469923783.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_08cc225aa814456eab80c3a7450bfdf1.pdf?index=trueIn PDF document text
    • http://verirajoxa.epizy.com/71481839185.pdfIn PDF document text
    • http://wuxigukupem.epizy.com/49160857713.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_3269d061cd9647dcbfc9b5b66ea10270.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_20961fdeed8f41cdbfbe1b9996f9e381.pdf?index=trueIn PDF document text
    • http://zawagebojirowe.rf.gd/15571722904.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 5552 bytes
SHA-256: ce6c0c7515964e0f7aa4d954e7e0ebef158959fb211e00e2e52dfd1d7fd19d80
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 7644 bytes
SHA-256: a746592d09b83ce712801d9cf7e3ceab4a9eca04ece3c92679bb29d2547343ac
font_02_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10316 bytes
SHA-256: e6e7200902d651a2c74eda438b4d3e1c6fd6d9eec99cb73616362e290ce5f0a3

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