Malicious PDF — malware analysis report

Static analysis result for SHA-256 908ed250c7c518ad…

MALICIOUS

PDF

72.9 KB Created: 2021-03-03 02:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0f850590337869011a6810fa5fe97ac6 SHA-1: 9372d73bcfaf13dd1e91f094ccf6168fcdeaee79 SHA-256: 908ed250c7c518ad270e59122a6438e938e76036e34db23a945456db8ca9e255
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=arrest+in+collier+county+florida In PDF document text
    • https://cdn.sqhk.co/bidekidarub/jcOhfn4/86075185337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475715/normal_5fc8b6d72ee11.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/bhgjhhi/download_game_shadow_warrior_ultimate_fighting_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/ggiEIje/anime_arcade_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/chghjii/sowonipubitujadozekuf.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/i43ieXh/krita_download_32_bit_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/Sigifhh/46891966208.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/4625f1b4d21.pdfIn PDF document text
    • https://sozivaxuzafuzi.weebly.com/uploads/1/3/1/8/131856435/dovilomuviziz.pdfIn PDF document text
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/86ff8606d27ab2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/vmware_vcenter_client_6._0.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/palugidituzuzowegusu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/brad_paisley_then_free.pdfIn PDF document text
    • http://nafaloputazesoj.rf.gd/35121513138.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5108 bytes
SHA-256: c74da5c16b21ba1f78f2ac766b6ef9ecf4157fdd9c4b073c3d6abc0c08e78765
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 10400 bytes
SHA-256: c86baa93c98656e3c65ce921d9f88d7ab9441dde8b93f2f686018841776889df

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