Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b92f9b3206a172…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 10:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5a32b937608391f064db55ca9efca9a3 SHA-1: ae94a25364d41b21149ea710193bcf9611bf9dec SHA-256: 87b92f9b3206a1727888ba75e5330dcb40b7ea10f62bf9b16976ea67bfad36c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=cloud+9+store+hours PDF link annotation
    • http://femuxeririta.mygamesonline.org/natixum.pdfIn PDF document text
    • http://iranianvc.com/dozimovemobabyrrz.pdfIn PDF document text
    • http://bella24.xyz/maritibukovufujxnh.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/xuxozavawesadelozex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_604deed6954f2.pdfIn PDF document text
    • http://myfirstsite.xyz/tijekowibafosekuwirufimitnqivh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411501/normal_60094e99a8c79.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/character_sketch_of_portia_in_merchant_of_venice.pdfIn PDF document text
    • http://newyearshop.site/how_to_connect_bose_wave_3_bluetoothk491j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_5fdf1d0fecf55.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/5917d8b23cdcadc.pdfIn PDF document text
    • http://nonretloli.site/lomagonekisukuwoxng6.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/1865218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_604a3203c3744.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/apqp_phases_and_activities.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_600a56e6362d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamapebonijos/viber_video_messages.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_67fb7bb4bed24f16a45a0748d13080ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/juegos_de_transformers_autobot_stronghold_hacked.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_eec824ca3bdb4d86828c1389e9ca9c0b.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_0b2b48643a5042b4878998fc8c18eb33.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 4608 bytes
SHA-256: 91134de6527707d6672df9e50368d183821077f05383c28e034d0738384d8b08
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10976 bytes
SHA-256: 37715793e5007fa7283b32dcc6dc8d9a3dabfebec4bcdb82a1ce0f75e597ab1d
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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