Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0b4bf1b1d4594f…

MALICIOUS

PDF

89.2 KB Created: 2021-04-20 14:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e438866272aac3fc28f1718aae10bc SHA-1: d7c4c71c7a6d29ea401a8ce0292a578f015e88b8 SHA-256: cd0b4bf1b1d4594f706e88f9d0ad2c6746ca9e3c03f56b4ddd2750c83a63b5eb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a high ML score, indicating malicious intent. The embedded URL `https://seumenha.ru/strik?utm_term=the+google+paradox+is+technology+making+us+smarter` is the primary indicator of compromise, likely leading to a phishing or malware distribution site. ClamAV also detected it as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=the+google+paradox+is+technology+making+us+smarter
    • https://cdn-cms.f-static.net/uploads/4457560/normal_60439252bf6ce.pdf
    • https://static.s123-cdn-static.com/uploads/4501659/normal_5ff2034cd2298.pdf
    • https://cdn-cms.f-static.net/uploads/4486197/normal_601725dfc156e.pdf
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/lumupi-jebedebub.pdf
    • https://cdn-cms.f-static.net/uploads/4369306/normal_60333240d413b.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_604837018df0d.pdf
    • https://static.s123-cdn-static.com/uploads/4383922/normal_5ff18ec8bb9e0.pdf
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/pipitemu-rufib-rametosakuvi.pdf
    • http://fastcreditcheck.info/how_many_calories_in_bean_burrito_from_taco_bell7ng4a.pdf
    • https://nubapatis.weebly.com/uploads/1/3/4/0/134095887/ed64aa869df5b0.pdf
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/lipegonadobifajo.pdf
    • http://prizinsta365.online/dawafekalavojironidinokb1vz9.pdf
    • https://bomitepoz.weebly.com/uploads/1/3/4/8/134895739/falelof.pdf
    • https://cdn-cms.f-static.net/uploads/4459463/normal_601f77cb18ae8.pdf
    • http://bazis-rostov.com/lost_lands_1_free_to_playtcwr9.pdf
    • https://dopizuledukure.weebly.com/uploads/1/3/2/3/132302960/44d82d.pdf
    • https://cdn-cms.f-static.net/uploads/4384143/normal_604b87adb3e8b.pdf
    • http://vkysnaya-eda.site/98701020334rgr3u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_d11c62a05d6e4b0c82a164574ecc7a3f.pdf?index=true
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_7b56c0ae4dfb49e9be1a01ecb8806152.pdf?index=true
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_34f5a05fd1b447c89ae1b076557eebd9.pdf?index=true
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_d7ba5dd5d945419c867e583a1f4cf80d.pdf?index=true
    • https://3211d54f-29bc-45c2-8691-939fa64f7450.filesusr.com/ugd/2e34c2_2cb37aa9744046d0b97aa22ed69ad554.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_off00011b8a.bin
875b4e4c04c2a5267caf8e0d8be2ebd832b77d4e6cd29e87f2a163532cd09cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 5668 bytes
font_01_sfnt_off00012eb9.bin
76ab60e4bb2e2b7919e3d3e0036bea75e15fcdf2b56775d5787f4bf8de8c5785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 12680 bytes

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