Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2552524b5ac4c59…

MALICIOUS

PDF

80.6 KB Created: 2021-03-31 10:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f35a1551d258c3bd40e15eff4f02d11 SHA-1: 2750b0911a45e6d3ad8f2024a7416ea904e9c1f4 SHA-256: b2552524b5ac4c59fbafcad2a64f278d2ca7d91637a6d48596b60e509ded7b46
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The presence of multiple external URIs, including one that explicitly mentions 'free onenote 2016 tutorial', suggests a social engineering lure to drive users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=free+onenote+2016+tutorial PDF link annotation
    • http://lami-lashes.site/31517623299wlxzj.pdfIn PDF document text
    • http://freud.icu/fidusol44tjq.pdfIn PDF document text
    • http://dulexip.22web.org/free_printable_handwriting_sheets_for_preschool.pdfIn PDF document text
    • http://telemprom.xyz/marketing_management_textbook4f3lo.pdfIn PDF document text
    • http://bnatural.space/driver_booster_keys8abhs.pdfIn PDF document text
    • http://powerpoint4you.ru/91119439724w87rb.pdfIn PDF document text
    • http://swiss-gear.store/ubuntu_bootable_dvd_isojns0i.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/halo_effect_marketing.pdfIn PDF document text
    • http://specrazreshenie.com/passassured_top_300_drugs_quizletmdzf1.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/debufoda.pdfIn PDF document text
    • http://alcexpress1.xyz/dalitafaxumege4fhs0.pdfIn PDF document text
    • http://neuroncraft.online/81036393456e9jjn.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/spanish_color_by_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuvuvemalazot.epizy.com/behringer_xenyx_1204usb_review.pdfIn PDF document text
    • http://vamudijikepefos.rf.gd/junagobize.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/dusozimejudebofobo.pdfIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/alpinia_officinarum.pdfIn PDF document text
    • http://sulumasofip.epizy.com/39749803477.pdfIn PDF document text
    • http://sisedatumunamo.epizy.com/how_to_refill_hp_ink_cartridge_655.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/abdullah_ibrahim_the_wedding.pdfIn PDF document text
    • http://judejelalub.rf.gd/greensleeves_guitar_sheet_music.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_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 4936 bytes
SHA-256: 60faab06a37c369602f6e2d53bf1e2071cf63fc2ae835eeb0f7ac9f898ac3441
font_01_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 10740 bytes
SHA-256: f967e260726c0d0e54c8d2fd4adf2ece982fe69d5fd311462454caf48aa2781d

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