Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f5b0001bf13cf4…

MALICIOUS

PDF

78.6 KB Created: 2021-05-14 02:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 190ea36f615eedbde2a45bf017550035 SHA-1: d17fc3a0e78352596d4e682c86e3270f8a8c27b6 SHA-256: 54f5b0001bf13cf4087badfd3551e9d22863787573d53e9607b0abc5f699662a
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 0.9996

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://crophysi.ru/strik?utm_term=what+happens+if+there+is+no+heartbeat+at+6+weeks PDF link annotation
    • https://cdn.sqhk.co/wogefosa/hjbhfaj/50233272991.pdfIn PDF document text
    • https://cdn.sqhk.co/zokirafuka/vieaOig/date_sheet_aiou.pdfIn PDF document text
    • https://felomogolupa.weebly.com/uploads/1/3/4/3/134345494/02be036e2f066.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/6704948.pdfIn PDF document text
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/da1f2a3a9c6488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_5fd7ecfce223c.pdfIn PDF document text
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/8403076.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/rafose.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/zepufejojojiralofuvigemok.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/icibgj4/kufop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_605429681d3aa.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/7771100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5fcbd7ed9fd7e.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/4973164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485695/normal_5ff4b67f6f061.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/37eaf49a205e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5fdecbc2e978e.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/da073.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/1371805.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/rojikevebese.pdfIn PDF document text
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/nokokule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/iso_7816_4_apdu_commands.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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 5420 bytes
SHA-256: 420dbee761ccc0975749f6b94851b55e5902eca22fd9f7250cf2e8d066e72dee
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 10860 bytes
SHA-256: f2c436104b0d33c285d98c0419f65cb5156b81ffb3de579a37fc0a18be4a5be7