Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36d9ac5623c7ee2…

MALICIOUS

PDF

80.6 KB Created: 2021-04-16 18:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b3be4a9a3f4af551860655b047d32e87 SHA-1: 22d2a2e988d5cf5c83552eb1c0c18bd0db46d1a5 SHA-256: b36d9ac5623c7ee215ebb869d3093ba303e0034c7a5e0b43fa99530c3951713a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the overall structure point towards a phishing attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=how+to+write+an+observation+paper PDF link annotation
    • http://winatesef.sportsontheweb.net/91944870164.pdfIn PDF document text
    • http://maska-respirator.com/best_football_manager_mobile_2020_players8gszh.pdfIn PDF document text
    • http://helpcreditscore.info/dofowamunuxakovarunafieiubm.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/homelite_super_2_chainsaw_reviews.pdfIn PDF document text
    • http://marketes.pro/merojiwazepodugakevenizdcx.pdfIn PDF document text
    • http://kzrovk.xyz/bejeweled_games_free_androidgjw9u.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/hhFVaWK/video_game_cheat_code_button.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/ovyhdnb/best_status_for_2020_new_year.pdfIn PDF document text
    • http://dujegud.getenjoyment.net/sasodixukiwazotelazola.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/61530965105.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/is_enfp_compatible_with_istj.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/dozereno.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/hhihcvF/wwe_raw_news_and_results_bleacher_report.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/66208543026.pdfIn PDF document text
    • http://xasujaru.22web.org/tuvokimubij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/lexanotuwa.pdfIn PDF document text
    • http://wiwekire.epizy.com/get_absolute_url_django_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/refined_carbohydrates_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/71943028659.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/zabaxoxelowugojuju.pdfIn PDF document text
    • http://dujaretikujufe.epizy.com/catia_tutorial_surface_modeling.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_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 5032 bytes
SHA-256: 54c0560b09b96ba23a167413dce23c6fca4490e08a5c4d08d589b89e43e7b4c5
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 10840 bytes
SHA-256: cd4b60cdd2492b776aa63dfbdfb6deabfa3728adc35ede73b0857fab25641bb7

Open this report in the interactive analyzer, or submit your own file for analysis.