Malicious PDF — malware analysis report

Static analysis result for SHA-256 855defadbde1f311…

MALICIOUS

PDF

94.1 KB Created: 2021-01-27 22:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: bbc7ca2fabc99d96741c2864626167f4 SHA-1: 0d69e8829f14b2734eba7d0a026b037705d86dcb SHA-256: 855defadbde1f31135f6b7a12c000469cda6610a0ffe22be4f249089e6d002a3
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to an SEO redirector. The primary redirector URL is 'https://druttle.ru/123?utm_term=dear+america+letters+home+from+vietnam', which is likely used to obscure the true destination and potentially deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=dear+america+letters+home+from+vietnam PDF link annotation
    • https://cdn.sqhk.co/fexilejedit/jegcbHZ/ivan_the_gorilla_painting_video.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/hjbZfjE/pioneer_underseat_subwoofer_installation.pdfIn PDF document text
    • http://korecos.ru/application_of_biostatisticssr3tl.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/chah3uP/79825266393.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/infZU88/48434475481.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/vesavudunijiwe-paloxijalibemur-sibajinese-likipevapojawil.pdfIn PDF document text
    • http://kkkirrreeee.space/ejemplos_de_textos_expositivosnts74.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/h9Pcjjb/bajar_musica_de_los_80_gratis_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/Nb1hevN/takenavonafobu.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/i4ghrhi/61696494092.pdfIn PDF document text
    • http://xeeewq.xyz/virtual_piano_sheets_minecraftkye1k.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
    • https://s3.amazonaws.com/kovibu/brighton_pier_group_plc_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/arduino_ide_software_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/floral_border_powerpoint_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/bottle_flip_3d_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/mcafee_antivirus_free_90_days.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/75502511602.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_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 4968 bytes
SHA-256: bf6aefb9f6cbd0147016bb9a1c9908d8a4b21c9a1e55a61d7685cada4a9784fd
font_01_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 10980 bytes
SHA-256: 52fa4865051b770ca2ffd9a6aa0581a615e0f322082205dacfaa16ee616ed3d0
font_02_sfnt_off00015cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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