Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3995d3204150b4…

MALICIOUS

PDF

81.0 KB Created: 2021-04-03 04:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36ae3298655b4e289cde10474a059ea SHA-1: 5e0605f2f533dfdc44e92588617e0dad38d95681 SHA-256: fd3995d3204150b44524f0a9f64575fbef50563bf0bff403cf18e731d2cc7fa3
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine results. The embedded URL `https://jumiwimov.ru/award?keyword=rational+root+theorem+examples+pdf` further supports this, masquerading as a legitimate search result to drive traffic to a malicious domain. ClamAV detection as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0` and the ML classifier output confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=rational+root+theorem+examples+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a716f9f3-5935-42d3-a0db-d21b244b917f/types_of_structures_sedimentary_rocks.pdf
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_6f4448a740fa4aa88f2b2b369556c560.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ae152d7-3edc-4534-a76d-f4826eec8810/how_many_calories_in_powerade_active_water.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_992fc8f720614217a60debe752de3aa5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b330d91-74c0-4b04-8de7-b59eadedfecd/tuxudowenabekoxired.pdf
    • https://uploads.strikinglycdn.com/files/44c608ae-3f2e-4596-8b5d-0df91279acbb/57711048048.pdf
    • http://namifaku.epizy.com/fobosokudosawarejafepe.pdf
    • https://uploads.strikinglycdn.com/files/83ad16cf-856c-435f-9c6f-dbe2a7d1a70e/power_cooker_express_parts.pdf
    • http://widenipana.epizy.com/beethoven_piano_sonata_31.pdf
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_8253530d37504e49a9f875343d5277b3.pdf?index=true
    • https://s3.amazonaws.com/senodiw/tetakuwub.pdf
    • http://boligasenupe.rf.gd/99981513945.pdf
    • https://uploads.strikinglycdn.com/files/aeda0772-f9bc-4de8-b041-50a7e0faf1a3/2008_jeep_grand_cherokee_headlight_assembly_removal.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_c4f1f0849fad482db41b00d6bb11dc06.pdf?index=true
    • http://zipodanej.rf.gd/combining_like_terms_video_8th_grade.pdf
    • https://uploads.strikinglycdn.com/files/8f79615a-7cdc-4ee8-b4d0-50b40fd9b433/witefofuwereloboz.pdf
    • https://uploads.strikinglycdn.com/files/76d53806-ad04-4bb9-8e72-1f5a3879e591/kinabes.pdf
    • https://uploads.strikinglycdn.com/files/34bee87e-cdde-42ad-b984-7f1909a69854/john_grisham_movies_on_netflix_streaming.pdf
    • https://s3.amazonaws.com/jafujasiwetid/rewrite_the_stars_piano_sheet_music_medium.pdf
    • https://s3.amazonaws.com/wujodibu/fewul.pdf
    • http://pasazaxara.rf.gd/gixiremijut.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ef.bin
3fa260cdefd0c9c7e195006f603d8515a42d24886cf42c0a7a14d206c1ecc3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 5356 bytes
font_01_sfnt_off0000fa01.bin
cf07dcea54d044012c78acdc98bea35c0416fc363ac339d875073982f7718035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 11536 bytes
font_02_sfnt_off00012171.bin
72dcaab4bac40bfeb2e2a9eb594531d5355772ab053baed00722e07d06dfd3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 16136 bytes

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