Malicious PDF — malware analysis report

Static analysis result for SHA-256 216bf202c39fc84e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 10:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89dd50fbdcf8294352874bcdd0bb6f21 SHA-1: da61703fd94d63a3ce161d2d053bfa444bf4b690 SHA-256: 216bf202c39fc84e65d74bb49cc2b5341946b7e7e7bcf7760ef7016abf1b18bf
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/123?utm_term=fema+is+103+test+answers PDF link annotation
    • http://xuluxefi.iblogger.org/mawopezasinekuxux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_6052b96eb081f.pdfIn PDF document text
    • http://tikewifijub.22web.org/fijagunasetedikakari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_6050ea782d88e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fdafd897d95d.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/eLGDZ4A/pacman_reverse_dependencies.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/0o5Fnig/autoradio_bluetooth_android_audi_a4_b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_9b5e7f67618e4c1388554d819aabe110.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/lupusepuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/formaggio_brie_ricette_antipasti.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/cute_baby_cartoon_images.pdfIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_e1ebefba6e6e4f2386d065cb2e2fcc82.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_c8382746777543cf8af8fd6dcce4e7db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/rolizoboxen.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_bcf5c9e2ddef40a5bfbb623b4176e200.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/puppeteer_chromium_revision_is_not_ed.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/setedilafilajam.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/31498038988.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_174869d6e3e64f1a934e4236885d2809.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5204 bytes
SHA-256: b2c5085ad4ced6dc54c28a5f94e58643533b9d3cb7f614c14a53870667c8e23d
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 11436 bytes
SHA-256: 8a87d71c693b724c6c1f42ee52fc36fbe2aeebc5c2fbb913f361aeeba6a14197

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