Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc6fe3b805f1897…

MALICIOUS

PDF

89.3 KB Created: 2021-05-14 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f5aa41ea94fc4ccd69eb352376a7ed87 SHA-1: 53afd553f254f98db7b0853b2d6320875e76951f SHA-256: abc6fe3b805f1897cee6f1a6d16c0851c3f981fa72a2a83858b57646104eff21
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://xezojetit.ru/strik?utm_term=latest+skyrim+update+xbox+one+mods PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425009/normal_602dd7c47849f.pdfIn PDF document text
    • https://vunamesu.weebly.com/uploads/1/3/5/3/135324142/waxetigakubasavobage.pdfIn PDF document text
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/timinibezeda-geril.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/gejbhjb/bts_army_wallpaper_laptop.pdfIn PDF document text
    • https://warupotoji.weebly.com/uploads/1/3/4/0/134000388/tofumurevubojiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/idicDMm/2977287022.pdfIn PDF document text
    • http://wei-nmvc.com/74321960618lnwux.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ghiygdB/fetetojubifaluwepivez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_60380de7c65b8.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/fsibigj/canon_print_inkjet_selphy_para_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5fff250de6fdc.pdfIn PDF document text
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/4511762.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/iaiee17/police_auctions_cars_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vanujapuduti/MjejgGm/vupoxufetajutomemomovadiw.pdfIn PDF document text
    • https://kifadinegek.weebly.com/uploads/1/3/1/4/131407901/luxalokamovinu_supusizu.pdfIn PDF document text
    • http://pesale.pro/how_to_start_of_a_romance_novelxi7mb.pdfIn PDF document text
    • http://nosinoski.shop/zenidobutujinvtqhk.pdfIn PDF document text
    • https://ninadagonalot.weebly.com/uploads/1/3/4/6/134668818/nedavolenorabe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 8320 bytes
SHA-256: 648b4cf6cb40ca3992f1ba26b81a07ccf4e7fa12f3a5e550b9aa903fce81bc80
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 5388 bytes
SHA-256: 011a70127ab674daf1891c1a978844410c6a50008531a2c5d5ad9cd04254cac0
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 12740 bytes
SHA-256: 7cb417347b53a3400503d4ac37bf88fcd77286a2b5004d040d66fb8e19bfc875
font_03_sfnt_off000140ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 16072 bytes
SHA-256: 70840b64088283e534b7ac5205ebbf9a8af6b056a2df43ad7d1f9d937f24ae68

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