Malicious PDF — malware analysis report

Static analysis result for SHA-256 368540c8c633e700…

MALICIOUS

PDF

82.3 KB Created: 2021-03-19 09:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf5f3a8179886d0aa0766f5c88b3d74 SHA-1: 18323d5bd1e6947448851c8a3d11fa80f1119214 SHA-256: 368540c8c633e7005df21fd34f437c409ff1a583fe38822079a74e7ed101bab9
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 are to SEO-farm-like domains, suggesting a link-farming or content-luring scheme. One of the embedded URIs, 'https://seumenha.ru/wix?keyword=texture+pack+1.5.2+pvp', is likely intended to direct users to a malicious or deceptive website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://seumenha.ru/wix?keyword=texture+pack+1.5.2+pvp
    • https://cdn-cms.f-static.net/uploads/4375694/normal_603ccd14c2d28.pdf
    • http://maslovauto.ru/57939498503b8n1d.pdf
    • https://cdn-cms.f-static.net/uploads/4459319/normal_603f090e36eb6.pdf
    • https://cdn-cms.f-static.net/uploads/4462093/normal_60132d9ba9d80.pdf
    • http://tokio-2020.fun/totasemnos.pdf
    • http://hookup153.online/30147495825i5d13.pdf
    • http://marinarus.space/regokibaleybt8e.pdf
    • https://static.s123-cdn-static.com/uploads/4469135/normal_5feb87d9c3d94.pdf
    • https://cdn-cms.f-static.net/uploads/4402712/normal_6046f8bebc1e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lorifumofelu/how_do_you_know_if_a_guy_is_interested_after_the_first_date.pdf
    • https://s3.amazonaws.com/dosipive/27161445782.pdf
    • https://s3.amazonaws.com/zowejunef/11620044463.pdf
    • https://s3.amazonaws.com/xoguwavosuje/abs_cbn_tv_plus_manual_search_frequency.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_1e3aa6721ed94469a30c3384c5675647.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_902669fe205b449696f92fedf0f90d23.pdf?index=true
    • https://s3.amazonaws.com/fifomi/mawuxilis.pdf
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_72e3988a9e934aa498aea3162bba56bc.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_off0000f88b.bin
5f781e428712c18ae2e9f20092c55ab97c8f41e2481e4b0303c89f92c98baa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 4816 bytes
font_01_sfnt_off0001091d.bin
79b55ad092aeef13739c3fe4569c3fe149cff0c06371ff3c774ea84df74f8219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10892 bytes
font_02_sfnt_off00012e5f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 4324 bytes

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