Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3309ac3ef23ad7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 21:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 581da927e4c1c911e78f69a3a726b220 SHA-1: afe5e4bbd7477257e17235096b3cc3bba9dcb9e2 SHA-256: 4b3309ac3ef23ad79d02210cbc77873e07181c084a59f8dde1db2b83ca24fce6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://ponafet.ru/wix?keyword=return+man+6+unblocked+games', suggests a lure related to games. ClamAV detection and ML classification confirm the malicious nature. While no scripts were directly extracted, the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=return+man+6+unblocked+games
    • http://lipenav.mypressonline.com/kibajumezajimigefifigizow.pdf
    • http://zexaribamemavi.sportsontheweb.net/foxixukedeligu.pdf
    • https://todulatewex.weebly.com/uploads/1/3/0/7/130738789/ba1c313829d2e.pdf
    • https://lugoponogib.weebly.com/uploads/1/3/4/4/134404253/dabibunadusapu_lotenexiwasekar.pdf
    • https://mabelobixos.weebly.com/uploads/1/3/4/6/134621829/d357fa251fcdb4f.pdf
    • https://cdn-cms.f-static.net/uploads/4446643/normal_601f5d4b8a495.pdf
    • http://suwefazimim.medianewsonline.com/febi_bilstein_catalog.pdf
    • https://static.s123-cdn-static.com/uploads/4391898/normal_60063fc0324b5.pdf
    • https://cdn-cms.f-static.net/uploads/4492253/normal_60588275c9a57.pdf
    • http://gemofesane.medianewsonline.com/minister_for_social_services_anne_ruston.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_567c29c51e034bfc9b586cde0b6fe226.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/anorectal_malformation_management_ppt.pdf
    • https://uploads.strikinglycdn.com/files/6bd30b27-fb76-4f10-a9e5-735562bda421/moto_g_6_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/fba7e056-1128-4b13-8936-c8b268101d0c/wahl_dog_clipper_blade_sharpening.pdf
    • https://uploads.strikinglycdn.com/files/32b4285c-e4b1-4c05-b473-8d4fc825c82d/royal_sovereign_portable_air_conditioner_heater.pdf
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_a01838b9e90442669d679885189a3246.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0195bcbf-63a3-44d7-8315-8c5659d2ed47/vonepodapuzelagibu.pdf
    • https://s3.amazonaws.com/tugumeb/xidaganoposiv.pdf
    • https://uploads.strikinglycdn.com/files/f37eb357-6fba-4d1c-92de-c908342337e5/jazamawexojaminezowa.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_94ed65773aed4e7eaac930f921a47b5d.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_off0000f7a6.bin
4f255c59258a9057464b74857c5daab2992e8b57de566b1b045fc4a0569dfe33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 5624 bytes
font_01_sfnt_off00010aac.bin
d1605a2016cab55976e4c1ca7408a21825ff0a8ece031e8b97789b0cd92d1c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 11184 bytes

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