Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d3c397559bf3fc…

MALICIOUS

PDF

110.7 KB Created: 2021-06-11 01:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35f7e45aba6e0d46714eaaad56b799c3 SHA-1: ed99653b0cb0ebfd2cc1e36d51f1113ceafec9c6 SHA-256: 25d3c397559bf3fc39cb4953264e02cad53986eb189a359bd2fc6f83afd4e98b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://infrive.ru/pbw?utm_term=golden+ratio+equation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fce15ecdc6c0.pdfIn PDF document text
    • https://donumidivapog.weebly.com/uploads/1/3/4/7/134734387/mufutafasopu.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/kuxufasaj-daruj.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/4d96c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_603fe8b47fc04.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
    • http://vogivakazela.pbworks.com/f/shaolin_soccer_tamil_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d4b471-e182-4e43-a546-43678da9ad07/saremonubititori.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144503946/xiludabexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3e2d48-924f-4300-bb53-9c480778150f/rca_opal_mp3_player_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8505b87e-5c15-4ab2-a3ad-cd74d9a5c3ce/jilunetamerujezejotavusax.pdfIn PDF document text
    • http://barotidi.pbworks.com/w/file/fetch/144758130/statistics_informed_decisions_using_data_4th_edition__-_version.pdfIn PDF document text
    • http://pafesudive.pbworks.com/w/file/fetch/144798426/povinosuzoleledaza.pdfIn PDF document text
    • http://razodegotit.pbworks.com/w/file/fetch/144729555/resident_evil_4_biohazard_mobile_edition_apk.pdfIn PDF document text
    • http://jotuwufo.pbworks.com/w/file/fetch/144877263/8974550409.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/nova_black_hole_apocalypse_video_questions_answers.pdfIn PDF document text
    • http://lipemuv.pbworks.com/f/97293013980.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 4680 bytes
SHA-256: 64ad06a9b67d7d17e4d2c9c5faf0e7629253b9c5cc784b8dc4e1fd2304b1ea24
font_01_sfnt_off00015801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15801 14588 bytes
SHA-256: 2036f038f865b55efaa9120caed0f9692eed381fa92e8bafa6f96b71a7e77e2d
font_02_sfnt_off0001887c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887C 16492 bytes
SHA-256: 139034ecbeddb59b5d924870e5bc632810dd4a9a1a462750ac9409b391bbc1d5
font_03_sfnt_off00019eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EEF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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