Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2912772ca5faa9e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-28 07:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6eca6407fcc68f681f7d6544f3939871 SHA-1: 2212fb686c743fa9472d1561bf56a3aa7df7d3ae SHA-256: f2912772ca5faa9e93d936ccd01b77b85d65f8e1cf60720dc870f1154cb59997
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=the+acupuncture+points+functions+colouring+book+pdf
    • https://cdn.sqhk.co/tejilunuf/Zhhidio/download_banana_kong_mod_apk_android.pdf
    • https://cdn.sqhk.co/ragejeli/nhflYhh/jack_s_world_new_york.pdf
    • https://cdn-cms.f-static.net/uploads/4471512/normal_601d6bbb75ebd.pdf
    • https://cdn-cms.f-static.net/uploads/4478664/normal_5fd331c193186.pdf
    • https://cdn.sqhk.co/towevefizub/rRjjf9i/vubal.pdf
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdf
    • https://cdn-cms.f-static.net/uploads/4490123/normal_603fad989b687.pdf
    • https://cdn.sqhk.co/sexifirume/hhdIbjd/light_bulb_colour_change_app.pdf
    • https://cdn-cms.f-static.net/uploads/4365613/normal_60450ab15383f.pdf
    • https://cdn.sqhk.co/lazimafuxuxi/abMjjyj/gisub.pdf
    • https://cdn.sqhk.co/gubogezemazo/kqhfiaB/forarokiliba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorifumofelu/definition_of_international_law_according_to_oppenheim.pdf
    • https://s3.amazonaws.com/luworizesupox/28164153925.pdf
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_2ff8b56c97d04e11ad2f6cdbfcd387c5.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_977b5c0f61ba44989ef0b89233e39db5.pdf?index=true
    • https://e3ba7771-1cf2-49b9-be81-d91832e8ed63.filesusr.com/ugd/bc9675_3611116fe7e94258b2dcdeea3e7e3f0f.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_de0ca8df237244d4815d8efb442fb630.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_a780edc8907d4bb8a641660b037415c5.pdf?index=true
    • https://s3.amazonaws.com/zoluwivebiro/secure_vpn_for_windows_8.pdf
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_797d8d01236340fd9d280776014c6959.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_off0000e3a7.bin
06d4d2536005d62eeb8430daf7568eb556ba471c262202e25a9c93624242aa0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 5572 bytes
font_01_sfnt_off0000f685.bin
7c032ffdef68fdeb4c96be00bd3ea7f148ef743d4839e70e9f8441c20be93504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 11052 bytes

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