Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f7b3b42cea79d…

MALICIOUS

PDF

84.6 KB Created: 2021-04-19 05:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fbed7067fdc677e43d8cc2cc43c1b876 SHA-1: ceefcf667dee2f44bfb172075f617b3a91588b86 SHA-256: 846f7b3b42cea79d02dcb26506beea0d501a254371c8ed9d9782354e8655ed84
134 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting and are designed as a link farm. One prominent URL, 'https://mezovuduw.ru/strik?utm_term=sherlock+holmes+movie+in+hindi+free+download+mp4', suggests a phishing lure related to movie downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=sherlock+holmes+movie+in+hindi+free+download+mp4 PDF link annotation
    • http://korsabarca.com/bupareladolulidokokizif0fwve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_6055c3a226819.pdfIn PDF document text
    • http://gufolitif.22web.org/cash_book_format.pdfIn PDF document text
    • http://teksalon.xyz/teoria_del_conflicto_derecho_civildedk5.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/13891224124bkd1s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_600600235b6c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_601338bccdb7c.pdfIn PDF document text
    • http://hamsterbig.com/free_printable_crystal_grid_templatese2446.pdfIn PDF document text
    • http://ig-mediateam.net/best_fall_2020_tv_showssi633.pdfIn PDF document text
    • http://sodahub.pro/17369010425sx5ln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_60673f4c21073.pdfIn PDF document text
    • http://hallop.xyz/app_store_itunest03w4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://murarefap.epizy.com/beats_studio_3_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/puzaduvepikejemevejabep.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/world_s_biggest_crossword_daily_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c261a4-d4ff-49be-bb6a-2acbb8840ca5/3798373078.pdfIn PDF document text
    • http://sixuregorajaso.rf.gd/svs_guidelines_aortic_aneurysm.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/34465791773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0298466a-4cc6-42be-8599-4d5d2fee6dc0/wivuwudefifafiwineburum.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/69442186676.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/18483209597.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_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 5804 bytes
SHA-256: dc7bd0f63aafb5ae0b5466907eb3519aed0c8d7459d28406dd41a9cfccbb0275
font_01_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 11036 bytes
SHA-256: 152a55745c2571610c805fae3d892dbcabe26a5b88e567cf21fae6fc95027b90

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