Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3881ab8ff69b1d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 12:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0349a7336a028f33a1317f8438e1a301 SHA-1: 90f7e7502e737b6a6727d04250dd85dfae9833ea SHA-256: ff3881ab8ff69b1d832db242cb79d4b722872da7ca731fc9ba871b2b093629af
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 0.9998

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://crophysi.ru/strik?utm_term=pendragon+book+1+online+free PDF link annotation
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/409d253a.pdfIn PDF document text
    • http://vedevejunogi.iblogger.org/ac_dc_tnt_karaoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fe2eab147ece.pdfIn PDF document text
    • http://axecheat6.xyz/lafofilomugoeb9qe.pdfIn PDF document text
    • http://xofenejilomoz.iblogger.org/debiruvifimaxesomokuge.pdfIn PDF document text
    • http://repair-kompov.ru/sabryna_nelson_alexopoulos6rinq.pdfIn PDF document text
    • http://bottlechainworld.com/jojimolapafufizopirolerf5m2.pdfIn PDF document text
    • http://my-favshopf.online/pokemon_alpha_sapphire_gba_download_androidjczry.pdfIn PDF document text
    • http://pitushok.space/17191781154y69lg.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/xibapagobawak_dutezafupo_vopiguroxu.pdfIn PDF document text
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/9a9c220a6189b.pdfIn PDF document text
    • http://espaceclient-cmb.com/mens_health_weight_bench_with_preacherlrmr3.pdfIn PDF document text
    • http://gtomishebs.xyz/tazolufewexfo2q5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5ff87bf2198b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408187/normal_60055cc2a9715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xejefexevopu.epizy.com/sejatoverapejobofinu.pdfIn PDF document text
    • http://voxinuxo.epizy.com/brother_dcp-_t500w_driver.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 5152 bytes
SHA-256: b1a92bf8d40413fe8198d88baceb1de8f0aee9465cf159dfbc763ba08cc7dc31
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10688 bytes
SHA-256: 8d780442c7090ecff23d46404d58ddf2a3c5c349c4d5de8457b12c83d030d6d2

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