Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b90ccb2f236c8…

MALICIOUS

PDF

84.6 KB Created: 2021-03-15 23:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 020d48d402df5195e43084cb67b4e825 SHA-1: eba636a783acd8f6c0fd993e341de0902adf15c9 SHA-256: 803b90ccb2f236c8f10b5ee70cd290c77430e9e914e14469a9d8e2fd87411856
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://soxebez.ru/award?keyword=princeton+review+act+book+2020+pdf', suggests a lure related to academic content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly indicate malicious intent, likely for phishing or distributing further malicious content.

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://soxebez.ru/award?keyword=princeton+review+act+book+2020+pdf
    • https://marelepo.weebly.com/uploads/1/3/0/7/130738501/8329366.pdf
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/fenazisaxixejo.pdf
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/efb4ef2.pdf
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/duderiwokonavetipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gekolutewubel.myartsonline.com/what_is_cross_cultural_tolerance.pdf
    • https://s3.amazonaws.com/zupenafud/9413366761.pdf
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_8e464b844ef74c119bbc3440b376c53f.pdf?index=true
    • https://s3.amazonaws.com/wakuzidi/fugifimoj.pdf
    • https://s3.amazonaws.com/jakujakula/tusipujusudabugever.pdf
    • https://uploads.strikinglycdn.com/files/20d3aab7-90f4-4447-a9b3-a23e8498e9ca/how_to_make_a_mayan_pyramid_out_of_sugar_cubes.pdf
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_15457fe41b1a4c5f986dd59180919f9e.pdf?index=true
    • https://s3.amazonaws.com/xomudufe/red_harvester_ant_sting_treatment.pdf
    • https://uploads.strikinglycdn.com/files/973ae98c-243a-4abe-966f-501acee47f02/how_to_repair_windows_10_on_boot.pdf
    • https://s3.amazonaws.com/fekazudabo/perisirafog.pdf
    • https://s3.amazonaws.com/baposivarabuj/watch_twilight_free_online_stream.pdf
    • http://sefowolo.atwebpages.com/phase_equilibrium_physical_chemistry.pdf
    • https://s3.amazonaws.com/jesidofefe/sql_server_2012_installation_media.pdf
    • http://gakilasefit.myartsonline.com/ocarina_of_time_sarias_song_notes.pdf
    • https://s3.amazonaws.com/rodakarugupoko/business_plan_template_for_bakery.pdf
    • 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_off00010d96.bin
64f202cfd881533415fa7ac475e915740aab987d3d95d4170443d36c98ee9ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 5572 bytes
font_01_sfnt_off000120b2.bin
efa8782467d3cf04d6513c4494b7e5cb8f8f20c3808c3018b2b61f2e9e03de85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 10680 bytes

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