Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7bdc06eadf8f35…

MALICIOUS

PDF

88.4 KB Created: 2021-06-10 17:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9ecf8258d8ad12270338899d9e0183be SHA-1: b6633028b167eff43e84bf0648442fb98c326f02 SHA-256: 5f7bdc06eadf8f356eaa1ea3b1a5907d4400ecd1454e14da66ec9c452085612f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://druttle.ru/123?utm_term=cours+d%2527+algorithmique+et+programmation+pdf PDF link annotation
    • https://tajedapen.weebly.com/uploads/1/3/4/3/134373213/zogunitu.pdfIn PDF document text
    • https://wetewiduwolenit.weebly.com/uploads/1/3/4/5/134599830/772537.pdfIn PDF document text
    • https://gelejidog.weebly.com/uploads/1/3/4/6/134688201/siziwasul_foteluvip_sodalaju.pdfIn PDF document text
    • https://junapeborizako.weebly.com/uploads/1/3/4/4/134443413/walir.pdfIn PDF document text
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/12b16cbdb4a0.pdfIn PDF document text
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/546834a22d198.pdfIn PDF document text
    • https://tovukofovimo.weebly.com/uploads/1/3/4/4/134485408/174795345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144980613/ready_made_pub_quiz_general_knowledge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503bde8a-bb41-4ec9-aebb-7a65c4b9eecb/muduzezofi.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144538527/nokia_800_tough_dual_sim_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32a28b9-9e63-454f-9057-5c664f6b0494/interpretao_de_texto_em_ingles_para_8o_ano_com_gabarito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed41586-fa60-4aff-8f24-942eb8f6cc17/bose_av3-2-1_media_center_cables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6615e8cb-3921-49f8-b821-98e38433e2aa/napejubifajux.pdfIn PDF document text
    • http://pozapagula.pbworks.com/f/finagira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03eaf8a1-edcc-42fa-a239-d76b72fff132/94924838340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b1f2ba-c76f-45f6-b28e-0a690f6a8518/husqvarna_372xp_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb397fc-d377-4979-860f-1cb56021c6f8/how_do_i_log_into_myhr_cvs.pdfIn PDF document text
    • http://figinav.pbworks.com/f/53426333056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53499eb6-81ac-45a4-abf2-5d71c98d9948/5835784622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51defdad-77dc-47ca-bab8-b0b48e76e34e/how_to_connect_traxxas_tq.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144862707/blood_type_b_positive_food_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b998ab24-c5d9-4032-b372-fc965dbc7b59/lekorosinowiretijafereda.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 5520 bytes
SHA-256: 0e6a6fd7a85069a1aaba1a7d5f20a69373028f4a55ded2e81c9aae1b6a11c46f
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 13480 bytes
SHA-256: cea3ec9fe7c2026f7e68bdfdcf9e875101d41424fab73198c3a9e0461c53f1bc
font_02_sfnt_off000137f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 17420 bytes
SHA-256: a08d037d5eb5cbf3657f8fef61ee891d463455f46ff6c41c927493cfa4314357