Malicious PDF — malware analysis report

Static analysis result for SHA-256 58787e262e414aa2…

MALICIOUS

PDF

73.9 KB Created: 2021-03-23 21:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4babce2e20c7c311f266d4e9726d96d4 SHA-1: 05ddbec64c0912fc99617a2ddef466202cf17127 SHA-256: 58787e262e414aa29f02d293e8feeb768692740e093ede3ce3123279fe375df1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a potential phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=presonus+16.4+2+ai
    • https://cdn-cms.f-static.net/uploads/4379038/normal_603a6290cef73.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_60388b060c4a5.pdf
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fd11076678d7.pdf
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5fcb1825ba0e3.pdf
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6019c825e8b2a.pdf
    • https://static.s123-cdn-static.com/uploads/4470224/normal_6001682480774.pdf
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/vugud_kegerexo_gegewoduguni_fadoxupo.pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/ddea7b4b66d9.pdf
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/gekuporu.pdf
    • https://cdn-cms.f-static.net/uploads/4504870/normal_6022d2f6236d6.pdf
    • https://static.s123-cdn-static.com/uploads/4457604/normal_6002153494b2e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lirifamagugo.rf.gd/53860475006.pdf
    • http://pitefabe.epizy.com/math_minutes_7th_grade_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/364c0c63-8611-41fa-995d-ac7deb3c3cda/old_school_runescape_trailblazer_league_hiscores.pdf
    • https://uploads.strikinglycdn.com/files/72f2fca2-d1bb-48ba-ab4d-ad9cb36bd593/calcular_volumen_de_prismas_y_piramides.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_5afb1072ec89451596848d73269366ec.pdf?index=true
    • http://jaxarafepemu.epizy.com/12006151950.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_6ef3994a27c54ec5a699880365962661.pdf?index=true
    • http://zaruxokogidut.epizy.com/wekasikapa.pdf
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_4689aa914daf4bb088ef64c3e8b30631.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d552.bin
473bb5183a949de6b697887782a2815745fd5212bb6c08ace0bea526a1e8d8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 4908 bytes
font_01_sfnt_off0000e60f.bin
5252e9d32dca9be65649c684fd1bbc71b64225785887da195eb1fdd30c4b074a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 11320 bytes
font_02_sfnt_off00010cac.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 4324 bytes

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