Malicious PDF — malware analysis report

Static analysis result for SHA-256 3691267d353d6a4e…

MALICIOUS

PDF

78.2 KB Created: 2021-05-04 08:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a3a64657acdaa887911e32262c85415e SHA-1: 9cb13f8dca03ec19217964a356761eaed8344548 SHA-256: 3691267d353d6a4ed45ee8723f9ee54aab39546739f3840e43d2b90364fb13fc
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a significant number of external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=what+does+yes+ma%2527am+mean+in+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498994/normal_603fcbd4bf8f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_60135b774059f.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/gNYi9ic/real_racing_3_apkpure.pdfIn PDF document text
    • http://899themes-demo.ru/stock_6.0_powerstroke_turbo_sizewxotp.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/jdhj1GH/94099932381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_600c913635d74.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/bjcEhaq/9901045431.pdfIn PDF document text
    • http://tizezs.xyz/what_is_different_about_iyengar_yogavrq13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_601e3adb5d309.pdfIn PDF document text
    • http://storeplus.pro/clasificacion_de_los_numeros_reales_conceptos_y_ejemplosys6w2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_600e1250d0f3b.pdfIn PDF document text
    • https://cdn.sqhk.co/tibazafex/pidggjc/metal_slug_code_j_apk_data.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5fdfd89f5278d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602badb59350d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_5fd2d104c1b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_6063ae9da7624.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/NFjcooX/android_7_auto_rotate_not_working.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/wenulevadazedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_bbeef965c4ad485382f40dcdc4e87dac.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_dc15c52c3beb476c855ec78d85198ea0.pdf?index=trueIn PDF document text
    • http://lugifer.onlinewebshop.net/how_to_do_arbitrage_on_amazon.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_136be73227444d869bc6548e60f79974.pdf?index=trueIn PDF document text
    • http://pugazapuxijal.myartsonline.com/25956019342.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_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5220 bytes
SHA-256: d325350070f4a6ae59930579c1c5a6236a2113e63cba97c52b94a8bca5693b7e
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 11840 bytes
SHA-256: 148815bce6a1da85c5ea5821f7687af3be5d3594bb9e6e68cfe4532bb479085a