Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c055080fcb469…

MALICIOUS

PDF

68.4 KB Created: 2021-03-03 11:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 0e9eb281dd6c53deda3bec473d9aa887 SHA-1: 43525916bba4d6e43af2f7a43e67a9c1aab908c2 SHA-256: 557c055080fcb46987f1392617f429e744cbf2b5a1765e25bf02e109ad1a7263
254 Risk Score

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
  • 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.
  • 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/award?keyword=la+casa+en+mango+street+audiobook+spanish In PDF document text
    • https://cdn.sqhk.co/tinodifozeza/VOY2Zgc/bot_libre_offline_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530937/normal_5fe24d4b7f391.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/bhazPje/poviridebejilelokegasori.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/jediliz.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/7273609646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_6023d623244b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5fe46df1d039b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_600f79616f8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_60143bd4a34f1.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxilumevo/xgfgggi/29998133617.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/fzheiY9/supertuxkart_online_account.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/c6zhbVz/download_slap_king_mod_apk_versi_terbaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fffb8d839e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_600a62ae9b97e.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/c2253dfd598f.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/Fg8YCij/vintage_label_maker_font.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/dVw023E/lightroom_presets_download_free_mobile_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 5600 bytes
SHA-256: 02ec192ec995e0190b5a3c359d29153da1183144ace85d9b11d23b62694be67b
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 10664 bytes
SHA-256: 3d392a71e127df72ab388fff828e4243932dee6752f2b991767219c289afc39e

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