Malicious PDF — malware analysis report

Static analysis result for SHA-256 488ece0e88882b5c…

MALICIOUS

PDF

73.6 KB Created: 2021-02-04 01:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 12595b6b7deacba7b6450019a3f083da SHA-1: 20dc5f8b6bbc3710bd6e25c90fd9856ddff133b9 SHA-256: 488ece0e88882b5c9df92e38e113de20df00dbee651396f517b8dc0af9e688ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that lead to suspicious domains, including one identified as a link farm on disposable hosting. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=pur+refrigerator+water+filter+4+ukf8001 PDF link annotation
    • http://carluxepaint.site/trivial_poursuite_en_ligneg6egy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_60060fe0e611a.pdfIn PDF document text
    • http://rumudasejozekes.iblogger.org/riremufuwonerener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fe784a3e32b7.pdfIn PDF document text
    • http://dvigatel.guru/new_york_city_fc_stadium_tourf8k85.pdfIn PDF document text
    • https://viramerobudob.weebly.com/uploads/1/3/1/4/131483281/5f9cbe9aed84a1.pdfIn PDF document text
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/2958958.pdfIn PDF document text
    • http://shopee24.site/kisabugelaxifuvibikeiy2cu.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/cifghhg/bakexawo.pdfIn PDF document text
    • http://fabulouss.space/mejubilozusunazotz9kf.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/djb48gj/nuvabitebanivi.pdfIn PDF document text
    • https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/44126b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexadujozopu.epizy.com/video_manager_chrome.pdfIn PDF document text
    • http://lopusewagini.epizy.com/multiplying_integers_on_a_number_line_worksheet.pdfIn PDF document text
    • http://kokiralasido.epizy.com/navaletazexebirikex.pdfIn PDF document text
    • http://wupubobetob.epizy.com/oblivion_sheet_music_accordion.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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 5388 bytes
SHA-256: 7b5522c8e2a3003bab918f0f5b6020e17f0024ef8de3976a0126411a767e84da
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 10980 bytes
SHA-256: efc7ffd4c86eed4270fac7f0005ab1aa52512f43375468187d08c47855e00e73

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