Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa3453352349aa3…

MALICIOUS

PDF

90.0 KB Created: 2021-03-05 10:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f6eda01b0e39ba6c09cf5e505626ed2d SHA-1: 21540510ccdaafbd610a53fdc7ae37f36034f66a SHA-256: 6fa3453352349aa3dc80df9264c29f44c923afa0ab33bcc9d1758e0af93c9fd8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=how+much+does+a+log+dining+table+sell+for+animal+crossing PDF link annotation
    • http://xivagoz.22web.org/repitelefad.pdfIn PDF document text
    • http://satogolijosefas.iblogger.org/zabilubaledevolusure.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/TuThfij/simple_chocolate_cake_recipe_with_brown_sugar.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/jhmKiiM/ffxiv_weaver_leveling_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/Ggf9hbi/hashtags_to_use_on_instagram_for_fashion.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hRgjlsU/pupuwepusikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/iichfhi/best_rc_buggy_1_8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_1842fdaa86cc44019a8b4e25190d27be.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_41fc12612e9e4d36a072982e5e2c400b.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_7238996cfc9a4c9882d57a6416b44db3.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_3a9dcfc0cb274be1a2e5264db190d047.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bafb5b-66a3-4937-ac69-fe873e8ddd98/guitar_chords_diagram.pdfIn PDF document text
    • http://lumadunap.epizy.com/48167499633.pdfIn PDF document text
    • http://pitidurafekuji.rf.gd/gugizumabevojoxaxilodij.pdfIn PDF document text
    • http://pavasokunise.epizy.com/are_ar_15_legal_in_ny_state.pdfIn PDF document text
    • http://pejonoma.epizy.com/doraemon_title_song_mr_jatt.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_54092bb9f27c4b9394c78900c9d90f94.pdf?index=trueIn PDF document text
    • http://lupipabibokaf.rf.gd/how_to_draw_guidelines_in_photoshop.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_98784b4c1d99471294a80422360ed983.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e801cb0e-6848-49d8-b35c-29648e35f657/best_self_tanner_for_face_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2954699e-4906-4aaf-b3aa-3663ea384ba0/51358022583.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 5628 bytes
SHA-256: 398ffd29e20b21a6db8a148327061e7a691c7cf8ebab4f6dd1c79aba7b9f8960
font_01_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 11848 bytes
SHA-256: 609cd20bf6facc7378fd6db49e6b5c42bee5633b86f53dbb467b38655f2cce46
font_02_sfnt_off000143df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 16376 bytes
SHA-256: b8f0b8fb60ebfb47767489457bc1ffe33e56de740274280fe32c2a86612d5b72