Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f45b5ff954def0…

MALICIOUS

PDF

76.7 KB Created: 2021-02-21 19:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d15623650b9e8d5e8b4fcf5cce8f16a9 SHA-1: 9d4d299c66c53994b636e7403a7231ea2cacd8b3 SHA-256: 13f45b5ff954def085fd0ebfdd1715ed9d548840209d48426b3f427903ab9767
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content.

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://leonvi.ru/aws?utm_term=clue+stage+play+script+pdf PDF link annotation
    • http://connexion-amelii.xyz/assistance_leslye_headlande0q8b.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/dewafe.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/5c43fcd749b9b92.pdfIn PDF document text
    • http://susurrus.space/iron_maiden_legacy_of_the_beast_visual_pinballtc7nn.pdfIn PDF document text
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/2ab69305859f67.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/igqigxS/drag_car_racing_youtube.pdfIn PDF document text
    • https://zodosibuje.weebly.com/uploads/1/3/1/0/131070625/13111dd4a5.pdfIn PDF document text
    • http://ladyso.ru/commandos_1_2_3ebiwt.pdfIn PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/gawuxurexefoni.pdfIn PDF document text
    • http://importants.space/cabin_fever_3_full_movie_300mbmxiru.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/sudevejerifu/wedding_anniversary_wishes_whatsapp_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/xfinity_xfi_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/ezdrummer_2_download_free__crack_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/49636399536.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/alien_shooter_2_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/97860945379.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5328 bytes
SHA-256: 0423899e252496353596df10259962d44ea92831ee14b2909e3ba263959d335b
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 11616 bytes
SHA-256: d655c52e4a70802dd3af164b20d5911bbd738e5b7af6571dad61239512d57260

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