Malicious PDF — malware analysis report

Static analysis result for SHA-256 55764ed29880cca4…

MALICIOUS

PDF

87.8 KB Created: 2021-03-31 00:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 58c7d32d170cf6749464d313c905d4e4 SHA-1: 515a9fbbd6ee2cbd939dbae0d021e2422040f4f8 SHA-256: 55764ed29880cca4f1ada9dfcf660a3606ea3e5bcf431dc0ee1199ca5313ff79
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 0.9989

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://jacksth.ru/award?keyword=arjuna+award+2020+pdf PDF link annotation
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/sawukatal.pdfIn PDF document text
    • https://vokipokulolobu.weebly.com/uploads/1/3/4/0/134016984/vixoti.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/93553d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fd627da42e70.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/86389742455.pdfIn PDF document text
    • https://rewesiriwo.weebly.com/uploads/1/3/4/3/134318955/zifavatoriz_bebagebig_fovefa_lefom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5fea1f8c5dbed.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/business_law_class_notes.pdfIn PDF document text
    • https://xaweguzo.weebly.com/uploads/1/3/4/3/134318762/0b2a78f33cc56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5fc93f0a2ee14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491669/normal_5fc9beab99c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_600ff307d5afc.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/totisobamevijuxuzudawova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_6006323c7fbc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5fe59fb6b12ef.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/60197835456.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/174d9bad.pdfIn PDF document text
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/dad00e.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/g2eiche/agilent_multimeter_manual.pdfIn PDF document text
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/67082.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/gdDjfih/78332506955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fc5ff6426edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_602d0bc8a76d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fd3dae42a2bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/brihaspati_vrat_katha_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 5256 bytes
SHA-256: 33d2bdcd011dcf7d80ff6d824a87424d7d926d52cfce07002cf1d9987e6de8dc
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 11032 bytes
SHA-256: 775bd49a974ef37c6f731802afa111aeacf78f32360e4e6a36dde111512b6bd6
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1