Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd8f6cd7b22fd3…

MALICIOUS

PDF

77.6 KB Created: 2021-04-29 10:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 724a8a73a90373a10e0cc0f8f1ec3284 SHA-1: 25ff2b7c507d7bf60fa7433aada32c331ad35440 SHA-256: debd8f6cd7b22fd38f9097ce0f38cdc0fc5cde800972e3d6fc93e11659a12db5
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 point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to harmful content.

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/strik?utm_term=the+book+of+birthdays+march+26
    • https://cdn.sqhk.co/zimopaji/Gpjehbb/foxycraft_download_for_pc.pdf
    • https://cdn.sqhk.co/wemonamo/dz6tvhf/rozegisisujalukutotapano.pdf
    • http://ing-jobs-opportunities.com/85423331718vizex.pdf
    • https://cdn.sqhk.co/mowanideju/igFhagd/78669449767.pdf
    • https://cdn.sqhk.co/jivonaxadu/hhiiojb/nanuriremufimuxagutewu.pdf
    • https://cdn.sqhk.co/xetilibul/igggDd9/how_to_enable_smart_assistant_in_realme_c3.pdf
    • http://interplast.ru/649773476310orya.pdf
    • https://cdn.sqhk.co/negolura/SPmhhXG/magic_set_editor_2_warhammer_40k.pdf
    • https://cdn-cms.f-static.net/uploads/4407301/normal_606d5e27aa0fe.pdf
    • https://cdn.sqhk.co/sitosuduf/GgjjgB5/chondrocyte_differentiation_bone_formation.pdf
    • http://honey-love.ru/77304852568uii2y.pdf
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff1fcc80de54.pdf
    • https://cdn.sqhk.co/woxemumi/hwo9LLu/facebook_app_download_ads.pdf
    • http://susurrus.space/bodybuilder_arnold_schwarzenegger_photosvimff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_2172ba670a6c4ee58e5d3890fca95e2e.pdf?index=true
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_89f95f5592284e6680cf18d0a4e0a100.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_62e5accc50114ab1a3441328f2c861cd.pdf?index=true
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_d1a90dc19836496989c362f4f00c8e94.pdf?index=true
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_9872bd0ada0f4a3c85474cff7c204496.pdf?index=true
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_34be66016d094dc78fdfba29aecef424.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_off0000f143.bin
86c7054db41358020d1b63fbcbcc450abd235f3138092dc90591841163f1e060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5768 bytes
font_01_sfnt_off000104cd.bin
81871c9c802430ec919e4deec4cf5b5bb1ed30c1d2764ca43687ab60c74e585c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10740 bytes

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