Malicious PDF — malware analysis report

Static analysis result for SHA-256 619f2862fef35ae8…

MALICIOUS

PDF

73.9 KB Created: 2021-02-21 19:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d923dd68bb27085b728604fc39c37817 SHA-1: d1afb94b01882ef209ddeca21a62d4819e7087fa SHA-256: 619f2862fef35ae8a8ab164153ce21a73552f4dc85f4b47b43673ddf8016ac55
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. This suggests the document is designed to manipulate search engine results or redirect users to malicious sites. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further indicates a lure to download content. While no scripts were explicitly extracted, the PDF structure and link farm are strong indicators of a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=fluval+fx6+dimensions PDF link annotation
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/6191341.pdfIn PDF document text
    • http://giftcard-sale.store/so_because_but_although_worksheetsij8a7.pdfIn PDF document text
    • http://nekretnine.site/war_of_the_gods_norse_mythology2a28y.pdfIn PDF document text
    • http://nubolats.xyz/tuzugovukabezowinogepitkm32.pdfIn PDF document text
    • http://ijmalan.xyz/datalidanogegoxutifemy4ae7.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/negikujezulex_sanumewawo.pdfIn PDF document text
    • http://prizinsta24.online/youtube_music_80_s_love_songsscea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_600dff98eac90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fdb672f2c092.pdfIn PDF document text
    • http://rebelliona.online/divajuwulop4pxff.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/2104154.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/xurixado/analisis_sobre_la_novela_el_reino_de_este_mundo.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/badrinath_malayalam_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/livew.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/feloj.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/xuzoluferuzaduzijedo.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/mobile_app_design_templates_size.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/best_hamilton_beach_iron.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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 5192 bytes
SHA-256: e8d3ae1b2407b305e379999165717b60b7f837e6bf91120400d440eeeff82680
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 10588 bytes
SHA-256: 0c220240db93cd696990e3c1281a5a764086bdbf74bbf28354bf0ba3a620a3a2

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