Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f9e541fa105f81…

MALICIOUS

PDF

82.6 KB Created: 2021-04-23 05:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 328902a61fca30b10591dfba71d7aa56 SHA-1: ee6f14c8a9a2e13e3e2aa348f730f094bc1331c5 SHA-256: 22f9e541fa105f81a219afe9c98ecd45a317fd1f28e02f997cf67b03135912aa
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious or SEO-spam content. The ML classifier also flagged the PDF as malicious, increasing confidence in its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=why+does+smoke+alarm+keep+chirping+after+new+battery PDF link annotation
    • http://gunenekaroz.mypressonline.com/applied_physics_1st_sem.pdfIn PDF document text
    • https://cdn.sqhk.co/zefadanexa/UONDgjG/steps_involved_in_risk_management_process.pdfIn PDF document text
    • https://sixusiwof.weebly.com/uploads/1/3/1/4/131454093/4355674.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/f650e23d448372.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/josaduwup.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/a0XBt13/77675758915.pdfIn PDF document text
    • http://nugitesa.iblogger.org/16129688926.pdfIn PDF document text
    • http://gidubanijokov.22web.org/what_does_blood_clot_in_the_eye_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/erghzA9/happy_birthday_cake_images_for_dad.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/dovefefawesetituto.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jdiVhjZ/stop_robots_website.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://funasuruwet.epizy.com/16218305313.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/welunirawemodepita.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/68587319519.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/the_book_thief_yumpu.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/49948842141.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/turipibafidipidoridu.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/easy_painting_ideas_for_beginners_on_canvas.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/86440285508.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5768 bytes
SHA-256: c9698b1fceecb7e30f7871bf6ea1cc08070524f0a1acfa74ace289129fc57875
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 10856 bytes
SHA-256: 9a7b73fa7122ded9b622cb02e96f111806db11c524d40cc3d9702b2d6fa1d59b
font_02_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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