Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a8c05a77c0a12b…

MALICIOUS

PDF

80.8 KB Created: 2021-02-22 16:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c2ecd0743f72fc5fd628e361cdac48b SHA-1: 9e7e4a40b150a4676ed06c651892b42c5f4da49b SHA-256: a4a8c05a77c0a12b7c13fc1383a9b4a103a9eae5584f1b39b297d147f5d67d7b
156 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 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 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.
  • 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/strik?utm_term=instrumentos+para+la+recoleccion+de+datos+en+una+investigacion+pdf PDF link annotation
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/275225.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/mugexiniruxapo.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/5218600.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/VhinE00/purev.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/hbibhaP/bixizupinuwul.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/d3c3fe444924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_60295391b782a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fd7c9cf2605d.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/fadofisidewe_sogivi_pojaluxidepo_mavoviti.pdfIn PDF document text
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/6053354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_602b25d87f87b.pdfIn PDF document text
    • https://jetebudatupa.weebly.com/uploads/1/3/4/7/134748577/sibawagavutizekevofu.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/7279726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luropiw/which_app_can_video_from_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/43598784648.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/brahm_kavach_paath.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/verinugomogula.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/free_cash_flow_forecast_excel_template.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_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 5472 bytes
SHA-256: 61a398c639df0a9749d1a0a1480fa7b8ebf826448eafc44042ec71828d528ddc
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 12472 bytes
SHA-256: 39b93ac130a424b35cd91afd5cb9306f089baf389bdfcffd79e0c570bf396a9a

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