Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd658e0013c831d…

MALICIOUS

PDF

78.5 KB Created: 2021-04-07 23:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2bcdfd4497cf75e5a7011323f69deb2 SHA-1: 5ad6a88064349f2c79437d2322fe8686975cad7d SHA-256: 6dd658e0013c831d12312449c7418467ff01f6bc43760c89fb22eec0fc5f9e4c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of external URLs and the 'link farm' heuristic suggest the document's purpose is to redirect users to potentially harmful sites.

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/123?utm_term=manualidades+para+ni%25C3%25B1os+de+oto%25C3%25B1o PDF link annotation
    • https://cdn.sqhk.co/dofexoxev/hgvnuhb/war_soundboard_weapons_explosions_ringtones_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/haOxvji/go_karts_for_sale.pdfIn PDF document text
    • http://sozolusi.iblogger.org/assistant_commandant_exam_form_2019.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/d_d_blank_character_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/9ibhjIV/sediridugewigoz.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/hghagid/gifod.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/L8JZgeI/36735263897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/asus_memo_pad_7_lte_screen_replacement.pdfIn PDF document text
    • http://sulijik.rf.gd/armies_of_exigo_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3941d67a-f56a-4a46-8f90-dc3ea954276f/is_call_me_by_your_name_on_netflix_uk_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/answer_the_question_in_complete_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b581d68-fce7-4405-bb6f-e6540f2710b5/edexcel_chemistry_igcse_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de5321d-94eb-4591-8368-b121a67d06de/sefexudutezibema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6b5f45-b3c8-4dc8-a70d-964a4e38f03e/how_to_reset_nespresso_lattissima_plus_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e93391-ee37-46a6-8c61-dedc33e28445/91618810842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd718cc-03a9-43e5-89a8-7cab6699f4e6/lojitoginapep.pdfIn PDF document text
    • http://sefegotanekexe.rf.gd/jagelibomowexiwibezumuji.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/denasitada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae539af-d8f4-453d-b658-539450334c65/walmart_photo_gifts_pillow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6fb58e-f025-4c93-a3c9-8720ec5d6822/69825328697.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5052 bytes
SHA-256: 13f54c410f239be5e067d23232cb11b1d3e6f4f90292ed1270fe6271d4209ed8
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 11476 bytes
SHA-256: 135534c8a0c4f6c1b9675e1c07023283b06dfc7c15cd5404e1f6687fcfaeff20
font_02_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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