Malicious PDF — malware analysis report

Static analysis result for SHA-256 f381c647efa9c529…

MALICIOUS

PDF

70.6 KB Created: 2021-03-15 09:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1e577451f9f3d4662ea1357f79755aff SHA-1: 78cf5381d07259d9ab08a666764daef4d977fc34 SHA-256: f381c647efa9c529f60d03efcb3bc3fc6eec653fd06dbb2fb3254f55af9473c8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=perfect+english+grammar+zero+conditional+exercise+1 PDF link annotation
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/a201f18e.pdfIn PDF document text
    • http://gisowutuxa.22web.org/thriller_uk_tv_series_episode_guide.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/ninere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_601fd25fa9da1.pdfIn PDF document text
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/4056803.pdfIn PDF document text
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/8052330.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/how_to_sync_xfinity_tv_remote.pdfIn PDF document text
    • http://puzuxozazepeme.22web.org/bpt_full_syllabus.pdfIn PDF document text
    • https://peposinosodidel.weebly.com/uploads/1/3/4/3/134317522/kovujejubig_razavijubuvosab_vewetari_getawutiverekol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fe21b588b1f6.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/bivakaseb.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/2dbd4a984.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/lejupodat.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/63000896721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5fc944cc1dca3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokarox.rf.gd/descargar_outlook_para_android_uptodown.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/cyberpunk_2077_get_delayed_again.pdfIn PDF document text
    • http://wilosokanik.myartsonline.com/treatment_of_anxiety_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6611a9-3953-4907-8ee7-f9253edb8168/newtons_first_law_of_motion_in_terms_of_acceleration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e87d87-acb6-40fe-9056-cb31d14e1b2d/nikon_dslr_camera_user_guide.pdfIn PDF document text
    • http://magoravir.epizy.com/mudoduregulivoriwizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b904e693-39f9-44c3-97d2-958cfd3fda25/jack_reacher_never_go_back_4k_blu_ray_review.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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 5604 bytes
SHA-256: e8e519c98a300b6e553b275bb0fe2ad511cc68b126385b321b4d554053eda846
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 10108 bytes
SHA-256: 81c711c864a14a691e42b4c9f06984bf2acb20246add8c339365b9d005cc4796

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