Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6b8c7a9bfaa5dd…

MALICIOUS

PDF

70.8 KB Created: 2021-06-04 05:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f86a4f8b01b181801389002e16a86cfc SHA-1: db229ac7a07d8dafe64bf7453a77a5f2002a7429 SHA-256: db6b8c7a9bfaa5ddd671c3da28d7ffb307b3fffd4bef4f3de296f75bbc319189
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://allytemp.ru/pbw?utm_term=o+maa+tu+kitni+achhi+hai+mp3+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5fd729f9d012e.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/sanipala.pdfIn PDF document text
    • https://gekalizafazidej.weebly.com/uploads/1/3/4/6/134699032/dixadenenibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ffc2426e30be.pdfIn PDF document text
    • https://xexofudef.weebly.com/uploads/1/3/4/3/134339501/lebonipavanu.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/e036c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5fdf88c925bfd.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/febosufoz_laralaf_dokusi.pdfIn PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/botodud_sibukapixekem_nagozur_zoxobero.pdfIn PDF document text
    • https://lefipejime.weebly.com/uploads/1/3/4/6/134668800/pofutuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pidexuxok.pbworks.com/w/file/fetch/144583716/bebukoxikobilip.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/f/zexifeguzukidosijipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5d2598-2822-4a45-ba7e-d6eb04e81550/zakopuki.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/mebagedakebafexoramadudi.pdfIn PDF document text
    • http://kusarolox.pbworks.com/f/68686535420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a433dd-9a90-4e9d-96ab-19bc56a44586/free_sample_of_reference_letter_for_employment.pdfIn PDF document text
    • http://xetuduju.pbworks.com/f/how_do_i_reset_my_beurer_blood_pressure_monitor.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144514827/how_to_unlock_all_characters_in_smash_bros_crusade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263e2302-0d20-42b7-8bf0-cf5587ec8abe/kugobererovijijago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 5152 bytes
SHA-256: e1d83df7e7a62bc5c6b892654815b6efab71f34b2f5c8fcde4405daab8ab1884
font_01_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 9776 bytes
SHA-256: 2c3b0aa5b176a7515e6f3409d3c11df1e0eac9b9ae0570b07e14fa0aeb546395
font_02_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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