Malicious PDF — malware analysis report

Static analysis result for SHA-256 d688350d3b10070a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 10:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b69e0cc600e7d98d3a5c3c35933150f SHA-1: e640e8067b646b0ceb5a01af14e44a215109f9a3 SHA-256: d688350d3b10070a1b3ed63ce15cc57ab577bf2b22748787028cfe3c30c3c967
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to 'nipisod.ru', which is flagged as suspicious. ClamAV also detected this as Pdf.Phishing.Trojan, further supporting a malicious intent. The document body, though heavily obfuscated, contains text related to an English learning book, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=interactive+english+listening+speaking+and+grammar+book+pdf
    • https://cdn-cms.f-static.net/uploads/4443608/normal_6039dbe299afe.pdf
    • https://cdn.sqhk.co/duxevowoli/Okjechg/26050897258.pdf
    • https://cdn.sqhk.co/semobisugigi/hAbvghR/zuvezesokuketajezifepasep.pdf
    • https://cdn.sqhk.co/janogoxuke/jdheKmz/xibiperiju.pdf
    • https://puxekubokoru.weebly.com/uploads/1/3/4/6/134683715/difekama-dopifinesusab-xipamobam-rozegadexuxapax.pdf
    • https://cdn.sqhk.co/tifisizeliz/mzP1jbG/kajepaboruzezoz.pdf
    • https://cdn.sqhk.co/lopijikuvi/iaibig0/gutizumurofinin.pdf
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/sawuxilanitu-torupuxedexuda-tuweti.pdf
    • https://cdn.sqhk.co/janurisu/jhDbid4/36292426153.pdf
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdf
    • http://fexevewuli.mypressonline.com/pentair_sta-rite_pool_pump_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4422645/normal_5ff50d90603f4.pdf
    • http://lakegefufen.scienceontheweb.net/animals_word_search.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_3740039a54bd44ccb8aa7ab50cef62ae.pdf?index=true
    • http://lusajafimaneru.myartsonline.com/dell_poweredge_r740_datasheet.pdf
    • http://kulebosux.myartsonline.com/english_writing_skills_ssc.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_0503d2698a714d95ae83f18dea757343.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_4f2e93574f6e4bb9ac3c76452e04b8ac.pdf?index=true
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_6896f3db851e4880a5945490149de89b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bb.bin
f19768fc30d66ec261b21cdafb7f85091009f5575aa87016240d70fe52372076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 5772 bytes
font_01_sfnt_off00010430.bin
505fcf2c57ba03cd77b220f887c4165a183218026c60c7b7eac866ad7a665731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 11488 bytes

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