Malicious PDF — malware analysis report

Static analysis result for SHA-256 4784aa634cc9ee05…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 08:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e5e137c070f3ae5b9b4317e2114b507a SHA-1: d7c61ae4632e633908c69e2e7ab057c48b9250ac SHA-256: 4784aa634cc9ee05ecd0908c87b4db71073523e0737dc870b9de9862c2b86a6f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains multiple external URIs and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and the document body's reference to a 'bowling fundraiser flyer' suggest a social engineering lure to trick the user into downloading a payload. The primary IOC is the URL used in the PDF's URI field, which is likely the distribution point for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=bowling+fundraiser+flyer+free+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5ffc0a4a01fb3.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/74172231736.pdfIn PDF document text
    • http://plusstore.pro/vadutoguta474sp.pdfIn PDF document text
    • http://albl.ru/tipos_de_clases_sociales_y_sus_caracteristicasbd24n.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/cibcNWk/treasure_island_book_study_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5ff454cd96368.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/0lHkCb0/pinkfong_baby_shark_remix_dance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_60088a52a4906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavisekenesavof.myartsonline.com/english_grammar_book_round_up_1_download.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_caa4b710fc8449b1b5071f5613ce8030.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_86c02a207a994634a5eb5ba134e67ab8.pdf?index=trueIn PDF document text
    • https://be1b941d-c88c-475c-9260-a39c9d088d9d.filesusr.com/ugd/5c562d_1eecc3ce654743219f280d59b3518e22.pdf?index=trueIn PDF document text
    • http://zakivijojinikij.epizy.com/agosto_dourado_2020.pdfIn PDF document text
    • http://bamogadosi.rf.gd/10462217671.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_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 5604 bytes
SHA-256: 7f83ce5736b1c8f4abd56afc6a8fce50469687ef006a7cc6a67ea8657f44dcf7
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 11020 bytes
SHA-256: 28eee0279fd1910751349139f97cee649e1ca1f7caf2c39064a9ec9e4af7ac1d

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