Malicious PDF — malware analysis report

Static analysis result for SHA-256 efad513040a71593…

MALICIOUS

PDF

79.8 KB Created: 2021-04-25 05:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac8e7bb013fc88c8a534c3bd7eaa123 SHA-1: 111cbb8e683f38fdbbc52e4103ace584a5c06408 SHA-256: efad513040a715933d76d44fbcd2377ec048a815e56de3eb960fa3d0870d9cbe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://resalured.ru/strik?utm_term=what+does+the+bible+mean+when+it+says+judge+not
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd665f9bc941.pdf
    • https://xugoxokolo.weebly.com/uploads/1/3/5/3/135392162/4745747.pdf
    • https://cdn-cms.f-static.net/uploads/4393220/normal_602e0de2ecd56.pdf
    • https://lipuriwos.weebly.com/uploads/1/3/5/3/135325722/wukije.pdf
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd64a044fdf5.pdf
    • https://static.s123-cdn-static.com/uploads/4470678/normal_5fe5a245a36e8.pdf
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/tidifulisixedalipo.pdf
    • https://rodofuzox.weebly.com/uploads/1/3/4/5/134599037/76ffc.pdf
    • http://kokulotasuz.mygamesonline.org/7024752762.pdf
    • http://jetavof.sportsontheweb.net/samsung_scx_4623f_scanner_driver_download_for_windows_7.pdf
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6011a98de3256.pdf
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5fdbb09e76b20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitizobuv/free_antivirus_anti_spyware_software.pdf
    • https://s3.amazonaws.com/gomaxod/zujogikuxogosizamaruvupik.pdf
    • https://s3.amazonaws.com/ladojenefe/what_is_my_louisiana_revenue_account_number.pdf
    • https://uploads.strikinglycdn.com/files/a529a023-0c4b-4c7e-a004-188ab53b6c70/list_of_influence_tactics.pdf
    • https://s3.amazonaws.com/kosipefojaw/26804122446.pdf
    • https://uploads.strikinglycdn.com/files/b8132a1b-326c-4e9d-91d4-15e4808d3aad/maya_angelou_still_i_rise_poem_theme.pdf
    • https://uploads.strikinglycdn.com/files/92df3e3f-bb11-4ebf-9213-7c1af8ee72c6/texas_cdl_practice_test_air_brakes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac6.bin
74c98cd2b26cc6228aafd7383efa598e9b1727846e44c829b87245a718cb5682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 5564 bytes
font_01_sfnt_off00010db0.bin
423bbe1c5de8e3b947e833e7decea25c4963cf3da3ebf3b6ed6171c6ea54ada2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 10476 bytes

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