Malicious PDF — malware analysis report

Static analysis result for SHA-256 66df6fa3fd1e71cd…

MALICIOUS

PDF

75.0 KB Created: 2021-03-09 04:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4cd22d1dcda12e5664455d6176ad42bb SHA-1: d7140b032d68d1199e60e73f8813e57cb33541d9 SHA-256: 66df6fa3fd1e71cd5a64b9e0d3ff76f254a837e06d0f74200a282e177b7fd191
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm designed to redirect users to potentially malicious sites. The embedded URLs suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=business+environment+subject+pdf PDF link annotation
    • http://goossyy.online/commando_2013_full_movie_1080podmmc.pdfIn PDF document text
    • http://ig-objectionform.com/what_are_3_types_of_social_behaviormmfnt.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/776541.pdfIn PDF document text
    • http://lnstagram-helping.live/pijutunetawinai8e7c.pdfIn PDF document text
    • http://phrensy.co/51423641238dw8wb.pdfIn PDF document text
    • http://getyourcredit.info/navy_seal_training_texasy9xr5.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/zinadigajufave.pdfIn PDF document text
    • http://quinzsy-studio.design/julebabatevozikuderomog9o63z.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/1752844.pdfIn PDF document text
    • http://ru-payment.casa/virologia_medica_manuel_vargas65qrl.pdfIn PDF document text
    • http://msertis.xyz/what_is_a_panel_ready_fridgeae4s8.pdfIn PDF document text
    • http://rastet-malysh.ru/pressure_conversions_worksheet_13-_1_answersmxre8.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/290f7b5c-6459-469b-b76f-539c8d8bbb50/79424743991.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/how_to_get_a_computer_job_with_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/community_ecology_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/71215788320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d6f700-0a99-4ea3-9513-16a4fe25d926/argumentative_essay_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/27374585093.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/obat_antasida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b41c56-5f50-4624-8681-9f03975273e7/can_illegal_immigrants_get_drivers_license_in_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b26a291-e85d-4001-b00b-7250f112b5de/83532876588.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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 5384 bytes
SHA-256: 1e516b952ef748856ecc42a552367dd4baf462d2b2deb65b1f74fcaf4c3cefad
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10476 bytes
SHA-256: 254a45f8f83d9961612483c19734241f2023abbefc5ba64b2b35c0c71de6b722

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