Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa3cb354f7f2b76…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 12:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ce64d8bb6c8334f19a13e639d0df3f55 SHA-1: 155cc3020fa8439a896f36d3bd3a7796a9cd792f SHA-256: bfa3cb354f7f2b76ad05abdf8d8da26d0b73beda61960c886e3762e06ee576bf
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-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://jacksth.ru/wix?keyword=enzyme+graphing+activity+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fe7841320f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5fd780e4ced02.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/fDCrAQu/gitidezejuxazafej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_600745d523193.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/ghjfqie/43748811544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_6028c3d29063e.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/UigZPgg/72465966932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_60179d05f02ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5fe51a508bd4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5feea5aa0d67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fe65e9849ee8.pdfIn PDF document text
    • http://rekabiwuxu.22web.org/jazz_standards_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_602855bf980b4.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://sitizef.rf.gd/toxezikevewarujenuguzow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7407066f-6f0b-429e-9f3e-a8206adfab15/plantillas_para_crear_un_plan_de_negocios.pdfIn PDF document text
    • http://jabujiwotase.epizy.com/dudilidib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639b450b-67c7-4e73-aae7-cf5dfca213c2/baxonakotobiruke.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/13017107330.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/bazajuleta.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5252 bytes
SHA-256: d6b992903f67bc40b65a12c10dbd7c40e241d5cbdaddc1d0c8d5430ef1151f17
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10880 bytes
SHA-256: ce4704a69699accdcd2ef4219598f3d486468066e5da11b71a264a2b4e88886e
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.