Malicious PDF — malware analysis report

Static analysis result for SHA-256 24edb1ecb5d61d21…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 04:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c480745258d59a57538ae7d10d69e79e SHA-1: 3e78af67d0e917b311eafe7cdf8ca2c452188afe SHA-256: 24edb1ecb5d61d213079d063a6e0a51b0cd09d148a18ed06676843cb2c0290ab
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to reference 'worksheet answers', a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=cell+craft+game+worksheet+answers PDF link annotation
    • http://aycotoro5.xyz/radeje6l0l.pdfIn PDF document text
    • https://cdn.sqhk.co/fujesepulo/fCUhbhb/90601635894.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/bjdXxia/grammar_school_test_papers_with_answers_gloucestershire.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/dBfhPpS/8738282407.pdfIn PDF document text
    • http://datofifuvekone.22web.org/ketogenic_treatment_for_diabetes_type_1.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/hihj6ie/pemakaposurama.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/tonotono.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ERQiijd/7673881683.pdfIn PDF document text
    • http://gogogoinst.xyz/pefagajukd9gn2.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/ropuwebeboko.pdfIn PDF document text
    • http://fixmarker.fun/jedudgzt33.pdfIn PDF document text
    • http://theporte.xyz/kewagulivekerofeohf18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f092bd4f-7d6b-419a-becb-f748fb39c63b/dell_optiplex_790_memory_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1488e23e-73a6-4a8f-8b54-38d5f2307226/iskcon_bhagavad_gita_classes_online.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_f26429e56e2c40c0bc33df74b1e633c3.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_26188043fd6548c8b149a8a42e5e572a.pdf?index=trueIn PDF document text
    • http://fozutonaxezofug.rf.gd/40495418876.pdfIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_ea23c2cd172b4762a4b8304745139ac2.pdf?index=trueIn PDF document text
    • http://dubafelizam.epizy.com/wawiv.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_83653be76e3b42ac977e2df1f78fb7e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e08cbad-d413-4027-baa2-e7194bac7599/38306658778.pdfIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_910d5de5d1474f75850020bc23c679ee.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 5356 bytes
SHA-256: 6f7b46660e1621692b1b5a5feff69daaf22f6457b4716c2bfda86abddbe9b9c3
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 11460 bytes
SHA-256: 0536e6974f52711a2db8c7a260b7dd018f33c993d4c8e1ca35c9966246ba5806

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