Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c2877aed2d59d5…

MALICIOUS

PDF

70.8 KB Created: 2021-03-23 01:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a047dad1b1c434560c110587e8284d0 SHA-1: d02338af4560390cb3d1f32f119d071274b42238 SHA-256: c6c2877aed2d59d55d2596a91bdfbe6e479d0673a461baed0b1ecde8594d6e73
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=solving+systems+of+equations+by+graphing+worksheet+answers+pre+algebra PDF link annotation
    • http://startbastar.online/yin_yoga_poses_sequencedw2o5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6049bdd4baa34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fd1222355520.pdfIn PDF document text
    • http://yarrebitteh.online/cnn_student_news_weekly_quiz_answersozvsb.pdfIn PDF document text
    • http://ca-management.website/bogijudumimumikevls7x4.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/6PjbjfY/toca_life_neighborhood_apk_aptoide.pdfIn PDF document text
    • http://polypak.site/266821825931he4n.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/9Diheha/3d_pinball_space_cadet_online_unblocked.pdfIn PDF document text
    • http://mabisujolaman.iblogger.org/a_travs_del_tiempo_brian_weiss.pdfIn PDF document text
    • http://organicsss.space/24947173758lsad8.pdfIn PDF document text
    • http://bestplacefor.rest/phenomenological_research_methods_moustakasphhqf.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/DAGjhii/64180396463.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/JW7zvhg/hockey_canada_network.pdfIn PDF document text
    • http://shoop-ff.ru/fall_guys_wallpaper_enginenrkgy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasekisuwub.epizy.com/25919083928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087daafd-cc73-4d3c-ace5-454142a3ea5b/how_to_spell_hebrew_in_hebrew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031cb3bd-a838-45a8-9ec5-ea78cb96004d/hamilton_beach_countertop_rotisserie_convection_toaster_oven_extra-large.pdfIn PDF document text
    • http://wovolujaniwuge.rf.gd/gutozofuzenesusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed12578f-6109-40af-932e-6d73814df414/planescape_campaign_setting_5e.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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 6000 bytes
SHA-256: 38c55962d48f11be23f8968c68cdb7d3308ed99ecf45012fba8e22c62286b1b3
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10928 bytes
SHA-256: f3b87002c795bfcb6d124576d94dd50c6ef5b0c5b7aaa3d38012e01fa16561eb

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