Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce939b8d9eb2b5fa…

MALICIOUS

PDF

78.0 KB Created: 2021-05-13 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c68efdd1a211055a5bb1793e5340e03c SHA-1: 29d1a7954b076ffbad394bb94d8a6b067f310f4d SHA-256: ce939b8d9eb2b5fa974a31bd3be9958e7078e4399b1c1db94a8076c75fb37c95
186 Risk Score

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 0.9991

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=char+broil+big+easy+smoker+turkey+recipes PDF link annotation
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/norodetesudopom.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/dopusosifa_denonaf_reporibusug.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/gisemojelefeteliwoj.pdfIn PDF document text
    • https://kewatedodi.weebly.com/uploads/1/3/0/7/130776291/sovusagakokowiwuwogi.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/beletristika_knjige.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/visomegelunezogir.pdfIn PDF document text
    • https://mirezavofuju.weebly.com/uploads/1/3/4/8/134870541/suxisaxasomuw.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/96601289605.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/gipikefajopujoxawodu.pdfIn PDF document text
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/kalokililebuko_fixasavozured_bemisujubizevid.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/calculations_in_clinical_chemistry.pdfIn PDF document text
    • https://ladevizeloraben.weebly.com/uploads/1/3/1/6/131606454/2356018.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/76912790663.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/256c17e6-ef21-431d-a189-3e5ea2396175/welis.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_28270e7f6a3c423b85ede8c460da6054.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_6dd0410fcf8c486cbcd3d6bd37608cde.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_c69899929a2641caad7ac15084168b06.pdf?index=trueIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_4a83dca84218446d9fcf39719a77b56f.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_f963143997d146819ae16dcb2f7d5aa0.pdf?index=trueIn PDF document text
    • http://rupesujutiwu.myartsonline.com/english_worksheets_for_kindergarten_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30180820-48a3-4310-a4de-afeb6c39cd7a/remington_700_sps_30-06_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38155e42-3bf4-4040-b95c-bf61d0044dea/capitalization_and_punctuation_worksheets_5th_grade.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/telecharger_dictionnaire_allemand_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b03341-f828-4f2a-9ab0-e07f375d70a1/23946593003.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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5556 bytes
SHA-256: fbe0f820c09679455f1f4da2d42ffe6afafa346b3fae791bcf94728752b0f536
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11180 bytes
SHA-256: 351611981f097521ef8df18d56a199ec1aa03ffb98c290a50461085bdb20113a