Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f3a3defb4407eb…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 02:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 076f3cfa1712179932e4de632d50dd64 SHA-1: eefe9bdad8dce7e88c420b94851778101bb3531a SHA-256: e4f3a3defb4407eb40f1ce09e8f8c9f7b6ee5d5946220fe45ea54d1e95b0fd74
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest an attempt to redirect users to phishing or malware hosting sites, likely disguised as search results for educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=envision+math+5th+grade+workbook+pdf
    • http://theharaka.online/81588714098oapc6.pdf
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/ee2c7d.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/anarchy_workout_abs.pdf
    • http://pexulisinipev.sportsontheweb.net/30597254022.pdf
    • http://popularchoice.space/actividades_para_3_de_preescolarcxl8j.pdf
    • http://rixorevu.getenjoyment.net/does_graco_pack_n_play_come_with_mattress.pdf
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/gorivilemazugekuxo.pdf
    • http://lumogodasekepi.mypressonline.com/84811246292.pdf
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/kamiletuj-xosogozepok-medugejopa-jedinizulokiwol.pdf
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/nugazivoxaza_meliw_tovejibek_dojepiwalik.pdf
    • http://ttttrrrr.space/international_day_of_the_girl_quotesj2ilc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jadudusujuje/zidoporimigekumada.pdf
    • https://s3.amazonaws.com/vosimalume/86841899528.pdf
    • https://s3.amazonaws.com/xulepiwa/sixth_grade_writing_worksheets.pdf
    • https://s3.amazonaws.com/vukumesoj/how_to_do_a_running_record_virtually.pdf
    • https://s3.amazonaws.com/nitirew/alora_orientation_question_and_answer.pdf
    • https://s3.amazonaws.com/bubeto/poe_alluring_abyss_guide.pdf
    • http://pimoxonevuwewax.atwebpages.com/ntn_bearing_catalogue.pdf
    • https://uploads.strikinglycdn.com/files/2a6b0c20-f4f9-42f6-b271-ba64f5b92c11/tws-k2_not_pairing.pdf
    • https://uploads.strikinglycdn.com/files/78e0e2e8-7869-4ad8-a8f1-95c8cb89b628/the_birchbark_house_chapter_2_summary.pdf
    • https://s3.amazonaws.com/zerepuzuze/75522326292.pdf
    • https://uploads.strikinglycdn.com/files/08da124c-d8b8-4554-9b5c-b532119f8115/33157072136.pdf
    • https://s3.amazonaws.com/wudibirewuduto/vanowutexenujivi.pdf
    • https://uploads.strikinglycdn.com/files/9d38780a-5941-4c6d-97be-a66cd2a8c0b5/lord_of_chaos_castellano.pdf
    • https://uploads.strikinglycdn.com/files/33b31d61-7c5e-4c58-a53a-a72fd8506ae2/braun_wheelchair_lift_parts.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc88.bin
b8c746cf0e3b0cf8fbf6ec714948f3f7f4e059dc005664b252995df8d752f639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 5648 bytes
font_01_sfnt_off0000ef9c.bin
070aca0b2b5e5f2a8574a3780aaa9102e458df7a0d67899fa62fa3b58cb46ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 11056 bytes
font_02_sfnt_off000114c5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 4324 bytes

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