Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c4dde56ae95cb8…

MALICIOUS

PDF

75.2 KB Created: 2021-02-15 01:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 866e90204e5b366b016a1863c0b1e04a SHA-1: 0875c34385c2e3b16112ad1be7e265d36fe294eb SHA-256: b4c4dde56ae95cb8b6deb4d2f3059db01d3fea3f08cfdbab10018a570a385fab
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to deliver a second-stage payload or lead the user to a credential harvesting site.

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=welcome+to+the+hunger+games+quote In PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/ketofabos.pdfIn PDF document text
    • http://idealica-italy.site/nail_art_stickers_how_to_applyf7kit.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/voJjajc/88065272235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_60026826c7ecf.pdfIn PDF document text
    • http://skout.tech/s_letter_status_songbpaq4.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/zerivibavowubo_fozanekuvanomiz_lasadepeletofoz.pdfIn PDF document text
    • http://fishing-rods2.club/79526527260u50gm.pdfIn PDF document text
    • http://legko.travel/18043236856tm8e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fed3c454d249.pdfIn PDF document text
    • https://tolonatapuxid.weebly.com/uploads/1/3/4/0/134042297/luzikivilubide.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/pjeLjaR/ballout_chief_keef_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/jjfjddK/40584067066.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/9ZUoiie/how_to_use_tinkle_razor_on_upper_lip.pdfIn PDF document text
    • http://jilet1.club/maple_leaf_rag_sheet_music_easympyus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jometuxinuvalal.epizy.com/logic_pro_x_user_guide.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/dragalia_lost_gift_guide.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5352 bytes
SHA-256: 2d7d1c1938db29c8d80420519bb1072d55542f9a5a8db9dcd191bdb2f5f6b76f
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10448 bytes
SHA-256: 0b56c91be0bc66a3e04c3385e31a08c7749ed8dd23d24084d99c706957ee3724

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