Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c945367ea708e6…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 12:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f3463afe0186201325bf9a157fac4ce2 SHA-1: 516b3c7cd5bf748fedd577f50d599f1f74a86b4e SHA-256: b4c945367ea708e6b21f5dada35b8beb68860b21f0854e7f6bf511710ab678c7
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 0.9995

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 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://lozipotod.ru/wix?keyword=ohm%2527s+law+and+parallel+circuits+worksheet PDF link annotation
    • https://xutareziwax.weebly.com/uploads/1/3/5/3/135327408/vibetofinixij_bovabatokusafi.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/5890cbfdd1e0.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/how_much_is_total_quartz_5000.pdfIn PDF document text
    • http://mofozojenanavub.iblogger.org/carcassonne_gold_rush.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/linupatiwuzikilup.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/58565823652.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/kufosizurukagu_fafipazijulinij_gibiwi_gifenemexogi.pdfIn PDF document text
    • http://misiliv.66ghz.com/animated_video_maker_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_b6cf6b2ffe6f4c6a85920bd3325288d8.pdf?index=trueIn PDF document text
    • http://jabejanaboz.atwebpages.com/washington_state_prevailing_wage_rates_for_public_works_contracts.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_15ffdc8914c74d37b88b9868ed5968b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/new_holland_pa_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/percent_composition_of_c6h6.pdfIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_37c5874dc35444ce969dfce1f3dd9f75.pdf?index=trueIn PDF document text
    • http://dunoziboxisi.epizy.com/32169589006.pdfIn PDF document text
    • http://zurilip.epizy.com/ardaas_karaan_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/89256333412.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/is_management_science_or_art.pdfIn PDF document text
    • http://xivivafin.rf.gd/dubai_babu_kannada_movie_songs.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_6d7dc2e961224082ac7df0804028516b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/fefuxo.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_0fd6604ca6a84ddca46f1fc3cbbd78ce.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5532 bytes
SHA-256: d5ee508baa65751865d2ca152e7db552f94bebd7fb8ffc4801b33bce72ac8e75
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10988 bytes
SHA-256: de846c530cdbeeca4686ce6aff8fed81136db86c93017c1aa7c208657202ef37