Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5b06ee6dd6aaef…

MALICIOUS

PDF

81.7 KB Created: 2021-02-27 05:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3d16fe4a818754f0bdbeb7f17c0d9e9d SHA-1: 30d7f8d8186b66f0330fd0a34c1ed58605d28828 SHA-256: dc5b06ee6dd6aaefa360448cad8fe4ec48316466176e5f2c45d63bfdeb932829
66 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/123?utm_term=why+is+my+pellet+stove+shutting+off PDF link annotation
    • http://vorakumezaxof.mygamesonline.org/with_gods_help_i_can_do_all_things.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366346/normal_600189348e006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5fdc4a1e5f259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5fd3d06d67fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5fc89656e5579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_60329433b8b6e.pdfIn PDF document text
    • http://bopepon.22web.org/sliding_drawer_box_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difiravopaju.epizy.com/good_will_hunting_in_spanish.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/16184150722.pdfIn PDF document text
    • http://jiwoxofor.rf.gd/what_are_the_4_types_of_informational_text.pdfIn PDF document text
    • http://vaxofijuj.epizy.com/zarobena.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/8482075173.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/dikugabanufolavatenow.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/94505427206.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_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 5184 bytes
SHA-256: 92108b5f8bbc872fb27112a8f2ba636887bd7f0ff5e992b3998d24395617f0e8
font_01_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 10848 bytes
SHA-256: 05536756bbbcf1d23b9837a1b3923aa0d17629bc01d7d32dcd191270c84b92e0

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