Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7fd1d33317894b…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 15:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d5aa607a6d0f1c071e4f35037105c56d SHA-1: 52f4904d34a2c5c9b1fb0be2786633877ed975a6 SHA-256: 1b7fd1d33317894ba54cc1bcfe4b33ce2b8d64c7619c82c92b2bdd31ec59fb5b
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 0.9997

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://garglob.ru/pbw?utm_term=binomial+exercises+with+answers PDF link annotation
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/kurabefekidoke.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/0e8825020e6d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_604bc71f61057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5ff62b6193f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6038bfe181b87.pdfIn PDF document text
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/56f8bee422bc70b.pdfIn PDF document text
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/barudoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_603eab7fe2877.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/3262549.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/sametetiwuwonoxom.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/nasegubugujet.pdfIn PDF document text
    • https://jojuvuzi.weebly.com/uploads/1/3/1/8/131871720/xexeva-kekoluzelarul-piripunin-kupomexebo.pdfIn PDF document text
    • https://pafofenolaf.weebly.com/uploads/1/3/4/6/134668810/012800bc7b0f.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/014f63fb-5f9a-47e1-a7db-f35f63ccbac9/arduino_elegoo_uno_r3_datasheet.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412176/fundamentos_de_la_administracion_lourdes_mnch_galindo_jos_garca_martnez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5de540d-4cb3-4f9f-9063-85d736354aaa/kerida.pdfIn PDF document text
    • http://rubuxesi.pbworks.com/w/file/fetch/144839835/how_much_oil_does_a_briggs_and_stratton_500_series_take.pdfIn PDF document text
    • http://zidedabi.pbworks.com/f/12689493359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35578cb-48cd-4cef-bad6-76091e282c13/2613039471.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/pegoxatenup.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144911568/46253510451.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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 5248 bytes
SHA-256: 83be6b19207c13b533b1d116aa29c113ea3adf821775b7f2165152b8368deeda
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 11340 bytes
SHA-256: 9b183b339767707a686e3bd797a95a118090c558f0f2974bda2d8e44766007bd

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