Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c580f1a25c672b5…

MALICIOUS

PDF

90.0 KB Created: 2021-03-03 06:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e806cec1fc55f96cb37b3c94c34eb941 SHA-1: 1098141f53719fbc18cae4cae920cd875f2f7e77 SHA-256: 5c580f1a25c672b5827c2db12600a70990c014e2acedd13f5e659e20973661e9
96 Risk Score

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 0.9997

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://nipisod.ru/strik?utm_term=whirlpool+washing+machine+manual+top+load PDF link annotation
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/aa88049a6ba7.pdfIn PDF document text
    • http://picsonair.com/317052921703i8mm.pdfIn PDF document text
    • https://zasubimivari.weebly.com/uploads/1/3/1/3/131383839/rukebamizotivis.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/xidojenenu-jitezonogufati.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/nosetezewote.pdfIn PDF document text
    • http://zavodtriumf.com/is_under_the_dome_tv_show_like_the_bookz3lgm.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/3012645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tarajix/aforementioned_information_synonym.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/memory_andrew_lloyd_webber_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/11429437833.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/27161341726.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/minecraft_skins_for_free.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/why_does_my_smoke_detector_have_a_green_light.pdfIn PDF document text
    • http://raferizowum.epizy.com/fossil_q_explorist_gen_4_back_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/conference_flyer_template_indesign.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/2621005202.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_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 5592 bytes
SHA-256: 6900249482e0626ff2a9dc636f3759ffe3bf096d7578985ee3afadd528813b8b
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 10844 bytes
SHA-256: ddb4daf16034dc468583365b6173a34c2cb9410fddc595b777b217469c4905ee
font_02_sfnt_off0001450d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450D 16148 bytes
SHA-256: 36f0f7c847a3d257bca3513ae5362ff552e89fccc363f2ec096b83b555007b24

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