Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27d27a65612fd0a…

MALICIOUS

PDF

67.7 KB Created: 2021-03-18 07:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 973d526de7dc70a7c4194677ce4701b3 SHA-1: 9998d80852c39ca6cb6d3d9217d1daf72b257cca SHA-256: f27d27a65612fd0a9286a6c94047bd9509991e7b26e54bf611232b6dcc76765a
104 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=auto+mechanics+fundamentals+martin+w+stockel+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385617/normal_6041bb6864a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_603b37563fade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_602f989874bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fe9171e091fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_60113b62e2acd.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/ximupuv/poxoxaxititoruguwewavofe.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/hootsuite_login_platform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1df16fe-bfe7-4cbb-bf5b-3fec5a038672/razer_blackwidow_-_green_switch_-_us.pdfIn PDF document text
    • http://tovivefi.rf.gd/guide_maitrise_d_ouvrage_prive.pdfIn PDF document text
    • http://fatufad.rf.gd/kezifowak.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/math_dice_rules.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_1e4a5e089d674306ae0a47a0361178ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/is_the_face_on_the_milk_carton_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/13089261551.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_bf3ae9ac25294b5db3e70a8acf1a7a3d.pdf?index=trueIn PDF document text
    • http://nivawuxiki.rf.gd/vepunix.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/57082641181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97158ba-766f-42e1-be05-c319bc65ef97/missing_411_books_ebay.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 5540 bytes
SHA-256: 337e1ff7f94474182380daa7eb5f6d29099a83739743c97ea82e4b4de9bad080
font_01_sfnt_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 10996 bytes
SHA-256: ddc03d2995f58531b59107c1cca57fc86d693e64a77caf798fd31a7ddd9329f8

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