Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd6a3a5da84f9ef…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 19:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab0ced21c83aeedfbb36ab98c1859234 SHA-1: b5e356643e98b13fff7d94fc89f27353ff10ab4a SHA-256: ffd6a3a5da84f9ef1401d5a9074b94fbcc9adfb226ad0f27b81c4499db99b744
186 Risk Score

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 0.9991

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.
  • 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=caballo+de+troya+2+audiolibro+gratis PDF link annotation
    • https://cdn.sqhk.co/zijigemeworu/diajbJU/call_of_zombie_y8com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6017402aef150.pdfIn PDF document text
    • https://cdn.sqhk.co/bafujifi/dI9iaig/13017106164.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/jdhaid3/jungle_adventure_sims_4_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/itjfkhe/tag_finder_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/kgcjfw9/come_avere_piu_stickers_su_instagram_senza_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/e7Tvngh/japanese_swordsmanship_classes.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/5rbgihf/65622257493.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/xuhh0ay/homeschool_schedule_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/goxejake/fL8gZic/76826002647.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/hZvigrM/wamugesixutapifazobese.pdfIn PDF document text
    • https://cdn.sqhk.co/kakovavop/jg5hchh/jaxakukow.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/Moozshj/pitched_tuner_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390643/normal_6009824b2371f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5fec01199c2d8.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/gurafoga/girly_wallpaper_for_android_phone.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_de713e885ca942f688709d6be042ceac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/ranuxirubugovejabamopas.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/dopuvujab.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_20e655382a1a4e8b97f4662715e80f5a.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_9036e899e4dc4829880c830d4350a6a1.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_6c0ecc6b74514bee944ff6b36d8b3e69.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_5d158cb0ca3949d6aaf2d8298ce8662a.pdf?index=trueIn 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_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 5164 bytes
SHA-256: f1d0ca7a226cc5d226063ee723f01d1df27edaad87f6844e43c6fe09dbda44c3
font_01_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 12280 bytes
SHA-256: fa4cfd95a70210bd7eeee3a45b0a1b22fe289187633def799995182541d1eede
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176