Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bef468791e9f674…

MALICIOUS

PDF

74.0 KB Created: 2021-02-18 13:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7aff69b8f9c7bdb64b0dd62df7f2e870 SHA-1: 125abce7f9a913fb0e1d154d16ed233fcaeaa7ec SHA-256: 4bef468791e9f6745d1307c2bd1f917ef7aaa0e6d7368a27efc3927d8beaa87f
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://yafferge.ru/wix?keyword=gbwhatsapp+latest+version+apk+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600af06761a9d.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/3808704.pdfIn PDF document text
    • http://mkr-olimp.info/lowikuvimovirinusexoxhxcwp.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/3920538.pdfIn PDF document text
    • http://smcjd.com/36999756877ot2x2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448341/normal_5ffce2536e7d8.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/fadot_sisumozupuna_zilotinadi_kiduwuzuvumuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ff4f8fab269c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_5fd6f3dfb8f9c.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/sefipa/lodamij.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/internet_free_calling_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/billiards_city_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/best_way_to_clean_dingy_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/ambient_rain_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/xolabusejodugixe.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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 5568 bytes
SHA-256: 79acda6602d82ed63ea793d87c6d64b9c2d6ce576d4728a4e4f7c60351487413
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10160 bytes
SHA-256: 8d439784e802dde4cc820748396e9d72b944bacc08383bb6819e4ed6d6503197

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