Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d28d54724e87d9…

MALICIOUS

PDF

85.0 KB Created: 2021-03-17 10:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 219bf8307122444a490096152515efba SHA-1: b50d17bbc43c1a2ac0e5be408e26d1da143e1dcd SHA-256: a7d28d54724e87d96039e9ebac16f683be0b31ab0479711ebb3f7ded25c1b5f8
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The presence of external URIs and a 'download' button lure suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://kuzutuzo.ru/award?keyword=after+2+descargar+pdf+google+drive PDF link annotation
    • http://vsspb.ru/kingdom_hearts_1.5_2.5_trophy_guide_ps4goddt.pdfIn PDF document text
    • http://dedosesegawiv.22web.org/zovinibab.pdfIn PDF document text
    • http://rebelliona.online/21297134009b31r1.pdfIn PDF document text
    • http://dukafufuxona.iblogger.org/gas_liquid_solid_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_d1b1fbd30e23457c939948fb86b8ee61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/445ccdd3-0292-47ca-9c13-e545a5010b7e/wibodexibusojedolirogewus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0e17e0-67f6-4839-8199-0daa1011b8ba/xubelen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63137507-866d-49ef-b59c-c6f41371db8b/21248950907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f36bd63-a511-46c4-b121-c6ca67c65dfb/how_to_wear_a_bed_sheet_as_a_toga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c41ee78-4b4b-428f-9638-0070b153a351/zufawuzivorojuradinasal.pdfIn PDF document text
    • http://bulekixor.epizy.com/les_brassages_chromosomiques.pdfIn PDF document text
    • http://repafow.epizy.com/bubble_sheet_reader.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_7eb6b2d5845f4d2e82fcaee08a2076c2.pdf?index=trueIn PDF document text
    • http://setavafajo.epizy.com/kimuki.pdfIn PDF document text
    • http://zuvemodu.rf.gd/94370500331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c70e328-6f42-44a9-8645-8e5a1d55f04f/59375693408.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_2df69c9b12434c31a1e270816d381225.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_7dfe504c0c7940a7b5816f51e5df93d3.pdf?index=trueIn 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_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 4816 bytes
SHA-256: cab77a04738ed5df3154d3589b97b4ef40597394ef7b9b670e008f5da3aa6e52
font_01_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 5504 bytes
SHA-256: d11ab1fb598f9732abbdbadb2e147766453b2ce367798a3e239df7cf92f89f2a
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 10296 bytes
SHA-256: 9f202e63fc724b300e00b3c3e527afeb1051e20384d5cbc292e1df8e14c838c0

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