Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4e73a397552d7a…

MALICIOUS

PDF

78.6 KB Created: 2021-06-01 09:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3816537e31a1ac4815ef971cf5f57f SHA-1: 9ea6ae6793dd84fec7c7141e48b2e9745cfc24f4 SHA-256: 4c4e73a397552d7a6e75766b9341668d13512add71f32c9acc2f7827dabae371
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm designed to distribute malicious content. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful websites. ClamAV detection and ML classification further support its malicious nature, classifying it as Pdf.Phishing.Trojan.

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://huntic.ru/pbw?utm_term=map+metro+amsterdam+pdf
    • https://static.s123-cdn-static-d.com/uploads/4407733/normal_60b3b61ce890c.pdf
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/6c879077896.pdf
    • https://mujatasibofemi.weebly.com/uploads/1/3/5/9/135963028/mumaporelosepa-jitus-fowodebejerok-bofijolanidujin.pdf
    • https://cdn-cms.f-static.net/uploads/4464311/normal_6041a98620991.pdf
    • https://static.s123-cdn-static.com/uploads/4476270/normal_6002a63cf01e0.pdf
    • https://cdn-cms.f-static.net/uploads/4383804/normal_60119a115e35f.pdf
    • https://tiwabegi.weebly.com/uploads/1/3/0/8/130874513/be254dc6eb1671a.pdf
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/ba2806145ee.pdf
    • https://static.s123-cdn-static-d.com/uploads/4477162/normal_60b4621c7e557.pdf
    • https://cdn-cms.f-static.net/uploads/4481424/normal_60546a9f9059e.pdf
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/09ef40803d494.pdf
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fe1560d98f90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da93ac16-c34e-4391-b1b6-7c7b1fec69ad/dd_3.5_races_of_stone_download.pdf
    • https://uploads.strikinglycdn.com/files/3a039e9c-23d6-4315-a040-7684f177a09b/72013379847.pdf
    • https://uploads.strikinglycdn.com/files/0b24d61f-2083-4e21-928e-51603afa33e8/office_2016_32_bit_download_free.pdf
    • https://uploads.strikinglycdn.com/files/4ecc7506-be32-4895-ad74-e775388d2e4e/dedusepijigekowib.pdf
    • https://uploads.strikinglycdn.com/files/12979491-3236-436c-b124-709dac01d239/fubumilupefejomofokoxar.pdf
    • https://uploads.strikinglycdn.com/files/f385500f-e908-4d72-b690-71475bee2662/graphic_designer_salary_in_malaysia_per_month.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_off0000f49d.bin
da9c191a4c1dc3b6827f57461ae064321f8cd36c892d02fe01000c111b8e8942		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 5160 bytes
font_01_sfnt_off0001061e.bin
0fdbf257dc6bf7da871b85218706008a2cb9f7f13c3404a154282477b4c92d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 11968 bytes

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