Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f592fb0c3a00c53…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 14:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 30830275cc0a4c16634c48ab8d77a3ee SHA-1: e34c9dfb59d05c6490d494738855c7a4815d1d19 SHA-256: 9f592fb0c3a00c537e5ce1ffb86a5f752347f93d645898dad4e696a74674a9b6
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 0.9997

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://midufefew.ru/strik?utm_term=dosage+calculations+practice+exam+hesi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5ff6067ec497c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_60333dbfcf454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_601f165239cf0.pdfIn PDF document text
    • http://insta-sale.site/wesovidumexamawevos98pgd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_6009d52ed2ec8.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/if0jhfu/88147713454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_601b454e0194a.pdfIn PDF document text
    • http://tryici.xyz/columbian_exchange_chart_worksheetmv3bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443819/normal_5fc8df940601a.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/hjkjqXn/loan_agreement_template_free_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fc8b0dd17271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_60438b1a52669.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/MgOjcib/alarm_clock_for_heavy_sleepers_pro_apk.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/bitegawekajarinanurored.pdfIn PDF document text
    • http://max-lifting.store/what_is_the_quietest_wine_coolerwh1sm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pasawe/zujim.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/28962762623.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/ketupuxanote.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/boxes_and_bullets_organizer.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/how_do_you_say_the_power_of_christ_compels_you_in_spanish.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 5296 bytes
SHA-256: 2aedb5bcd1189befc832157448585527e729ea3405676e6016729261c7f97986
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 11116 bytes
SHA-256: ca7e31f4fc2773fc70ac80a50fa1745914b4e9a8298bd2ba18892daffd6edf54
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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