Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f51a0527716dfd…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 01:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5ea8fbe43b4fab6a515218f0a75bc8e4 SHA-1: 61b073aa58a96dad46178117ef3aa61ed3798a99 SHA-256: 54f51a0527716dfd16a3b30cce61a8a42fd9285055ac07f530f9526d9918c775
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 a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/wix?keyword=map+of+ancient+egypt+worksheet+colored PDF link annotation
    • http://nukicew.xyz/sebutkan_4_penulis_mushaf_al_quran_al_karimey31t.pdfIn PDF document text
    • https://cdn.sqhk.co/wirepoti/iahjVjc/tiwer.pdfIn PDF document text
    • http://lynciguest.com/90518528536osz39.pdfIn PDF document text
    • http://italysummer.fun/memtest86_how_many_passes8o5ke.pdfIn PDF document text
    • http://gravkamen.ru/color_shift_wrapcb1jf.pdfIn PDF document text
    • http://mebelintera.ru/resiriperozimexohravq.pdfIn PDF document text
    • http://cosmosqrab.online/how_to_get_war_horse_rdr2_onlinedm1jr.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/84628270166vvhk6.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/dHY3ihH/jawagifedevojifajevilo.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/putudegisogobamamedidin.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/Fheggh2/virtual_table_tennis_3d_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39611e81-0038-4749-85e1-ac1123c5fa65.filesusr.com/ugd/b5472a_be6499e3a13745c4bc7406cbc5c016fa.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_c359f7b3fb9a4b7fa13ff705ebe7fdea.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_cdf09dcf5ba6475bb96dbd6bdf55e51b.pdf?index=trueIn PDF document text
    • http://zupitatip.atwebpages.com/61502635617.pdfIn PDF document text
    • http://jelunegizubu.atwebpages.com/ap_world_history_outline.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_ddf1aa5f4b184e99976ad06791c71f31.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 5680 bytes
SHA-256: c790138900b91ef31f6b536f2b7b5c8f445d23fd1fcb099d84ca646e0206dca3
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 10404 bytes
SHA-256: 6b7dbb2524fe972a89ba6473ca3f07efa001e5108a412e02523dccba09776b4c

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