Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be500cb1636440…

MALICIOUS

PDF

82.5 KB Created: 2021-04-28 19:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c83c8b7be69091ad18fce71c0b221c6 SHA-1: 7ac2760c479351f1b51c711819d7bf34ff4a42c9 SHA-256: 88be500cb1636440762687be73925f59185ef789798a0ff554134008d20cbd35
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to 'Jolly phonics workbook 6 pdf'. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://soxebez.ru/strik?utm_term=jolly+phonics+workbook+6+pdf PDF link annotation
    • https://cdn.sqhk.co/rovujesox/jhij7ii/songs_of_praise_hymn_book_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/TMnyohc/larry_miller_theatres_centerville.pdfIn PDF document text
    • https://lejufonibo.weebly.com/uploads/1/3/4/4/134470114/xazamupi_jodokeretotete_kigomowuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fe721ad0e00b.pdfIn PDF document text
    • https://muvitexovab.weebly.com/uploads/1/3/4/6/134639258/kuxokuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_606e8840c53d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fec9de7bc9e8.pdfIn PDF document text
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/68307c16b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6045d4b559064.pdfIn PDF document text
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/4817bd1705d99ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6047ebe38b417.pdfIn PDF document text
    • http://repair-planshetov.ru/dress_down_day_at_work_guidelinesato7l.pdfIn PDF document text
    • http://vertigoa.online/vuvobexeduvefodakupexavugl8b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5ffefc27d65ad.pdfIn PDF document text
    • https://gulekizusivo.weebly.com/uploads/1/3/5/3/135392766/3738026.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/3275b6b9-3e75-4a59-beb6-377bb9316edc/autocad_3d_software_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2d7177-c73c-4dda-9676-bf233571e102/vazoxejepajodupit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aa5a32-c55d-4a64-a490-530be1d473ca/pofitalafemafak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 17956 bytes
SHA-256: 992bd30a167212ed366733518a02a81cd65abd05f4e1e90121b97830dd8c39ed
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 5572 bytes
SHA-256: 0f95a48dd1d4dc5db067e7e76942a096afedb55a9a8aa3c5a99ec03b8d3866e8
font_02_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 10240 bytes
SHA-256: 09ffb57ed919ff560b44dce4ea4f7dc4c3b1fbf41bdf0d0b654ce40d56a3b07f

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