Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4df448d416274de…

MALICIOUS

PDF

74.0 KB Created: 2021-03-19 16:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bc0e4113ea3ee158260dda883e7963c2 SHA-1: 262410cee34e5fc1dda3c3335f043c36ac9eed2f SHA-256: c4df448d416274de680c3b43a0d563b111f5c7f298e0ef46b66159ce85cb1145
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with at least one, 'https://bologen.ru/award?keyword=multiplying+algebraic+terms+worksheet+pdf', appearing to be part of a lure to download further content. The document body, though heavily obfuscated, suggests a theme of educational material to mask the malicious activity.

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://bologen.ru/award?keyword=multiplying+algebraic+terms+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/niporatibu/hjgjhhb/bichhoo_raja_full_hd_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_6039d7b021efd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5ffa834bc214d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_5fd70b2e46eef.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/72143049923.pdfIn PDF document text
    • http://golitibixodeku.iblogger.org/75153469149.pdfIn PDF document text
    • https://cdn.sqhk.co/xivudebisov/hfgdghQ/zombie_killer_survival_3d_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mejadub.epizy.com/nozerosovasejezenuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cc60f4-18fe-4d42-8406-bec4d8f598a7/kivituruxofozidesem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b03add-13ce-42eb-ad44-30c777d80ec0/96723378127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300f87a1-ab0d-4feb-93d2-36b63ab162ad/72915757023.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/22356066373.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/stoichiometry_and_gravimetric_analysis_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/bole_chudiyan_video_song_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a112462-38a4-46c6-b3d9-8ead40bfb4eb/set_for_life_scott_trench_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/vuniridinesinos.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/asphalt_mix_design_example.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5972 bytes
SHA-256: 679bd9b2b7eb505502e0744cfbf7b53e14fbc4efeae22c924429fecbfac14d81
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10728 bytes
SHA-256: 360a5e7fb1482c630c5e062a5811ad7322bb1eabab4215bb5109568b8e5eba9d

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