Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a1a7ad2f56cd58…

MALICIOUS

PDF

77.6 KB Created: 2021-04-08 14:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c1e084028b9b060fe643e8084a265b SHA-1: db59332556a981849523a28c4fc406d7cd297244 SHA-256: e4a1a7ad2f56cd58b65b2cac5b841da649193a77d1cc4bbfb740e3929aa17076
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=strategic+relocation+book+4th+edition
    • http://subikizivuwen.22web.org/project_calendar_template_excel_free.pdf
    • http://namelesssouth.xyz/58193548880vqc03.pdf
    • http://pusosokus.iblogger.org/74152629405.pdf
    • http://jezegejinufekav.22web.org/resumen_del_aparato_respiratorio.pdf
    • http://sun-italy.space/28372715649t1fgz.pdf
    • http://itawegan.fun/baldurs_gate_dark_alliance_gba_rom_itatwyqu.pdf
    • http://venira.su/69369349684afhs1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_cb01299bf70044c181595b95ab1f2d11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01a1f205-2fc7-48ba-8e4b-44c6d51d3ff6/what_does_the_fall_of_the_house_of_usher_symbolize.pdf
    • https://uploads.strikinglycdn.com/files/717839d7-c99d-4944-897c-a74fb3326638/diwoxenelebaxuwigiz.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_13cf8c775f0f49fb80372abda19eb71a.pdf?index=true
    • http://tomoveko.epizy.com/46641003081.pdf
    • http://nuzabasere.rf.gd/vamutulolosabewabojudaza.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_4ffab5ce134e46b39f426197017608eb.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_15b3ac7f91574effbe521b325f3a2084.pdf?index=true
    • https://uploads.strikinglycdn.com/files/154b35a1-bc67-4533-8934-c2a0d60184de/sylvia_plath_the_bell_jar_espaol.pdf
    • https://uploads.strikinglycdn.com/files/9cf9dd04-cb06-4c8e-b5b2-337fd8db31ca/bugesagemejakoninutasati.pdf
    • https://uploads.strikinglycdn.com/files/b7ed4821-daea-465d-bb1a-b9e6a94990c6/a_streetcar_named_desire_quotes_blanche_lying.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_bf7f8fd90b8241149714d8536c339db7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c32e4a4-ff1b-4259-adb8-ae3a8726d02a/xogizitizaparevutoziza.pdf
    • https://uploads.strikinglycdn.com/files/c283a672-09de-49b8-a27d-6156a5234fc6/94815253813.pdf
    • https://uploads.strikinglycdn.com/files/8701cd71-daa7-4428-aab7-d39538287cb7/data_structures_and_algorithms_in_java_6th_edition_github.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95a.bin
392aec776e2e23b86ea167249c3ff95afca01eab435aa857022deff3b107a0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 5420 bytes
font_01_sfnt_off0000ebc2.bin
975205bc87675b262cc4b6edd918d57c22183415edfda862977f3235db73bef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 11964 bytes
font_02_sfnt_off00011421.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16204 bytes

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