Malicious PDF — malware analysis report

Static analysis result for SHA-256 7043fadf76c9b9f8…

MALICIOUS

PDF

76.8 KB Created: 2021-04-01 10:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 714ebfcffd62c3d1d21622de6588f780 SHA-1: 20c5a5f170b23d0810bf8b28db7bcc595f70fec1 SHA-256: 7043fadf76c9b9f8aedb819e749bed21035d16c74c48af8076aa389aae95cedc
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://resalured.ru/123?utm_term=yellow+coldplay+alto+sax+sheet+music PDF link annotation
    • http://kyponnik.online/59148594056fbnyl.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/3r80Iiv/fanemimobulejapisaxodifa.pdfIn PDF document text
    • https://letunaxure.weebly.com/uploads/1/3/1/3/131383761/ditubefawivis_zonuzofese_kaguworofomiwo_vudabatinoredop.pdfIn PDF document text
    • http://ketrovk.xyz/best_fingerpicking_guitarists_in_the_worldhh2wp.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/ggzFJtW/marvel_future_fight_apk_latest_version.pdfIn PDF document text
    • http://shmelev.pro/18969807472m7sur.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/xasamonegera-jigefaxis-xatorejuza.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/eYCGlvw/jisopafenegefuxepegulo.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/Z7Dwvic/16226192754.pdfIn PDF document text
    • http://logoped-samara.ru/energizer_battery_charger_specst1dwn.pdfIn PDF document text
    • https://cdn.sqhk.co/nujorazaje/VhhB06i/beach_survival_island_2017_savage_2.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/jhPhjaX/tezubanusow.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/7871714.pdfIn PDF document text
    • http://arbitestpark.xyz/8249319370rl64l.pdfIn PDF document text
    • http://getcabinets.xyz/gasukorobujikarurc1fdv.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/g0BhhaI/kabazasivefiwan.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/ge1Vojc/active_followers_on_instagram_buy.pdfIn PDF document text
    • http://freehookup.xyz/behringer_model_d_manualfw1nr.pdfIn PDF document text
    • http://letxxnx.org/broken_hero_sword_terraria_androidihlxh.pdfIn PDF document text
    • http://persequen.com/financial_accounting_tools_for_business_decision_making_9th_edition_wileyplusw9mxx.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/tezude/35642200633.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/godenevemorobalerinute.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/54865501470.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_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5440 bytes
SHA-256: f0911a9a441a288d87eaad0f5cbba5d4c92a68725ad2a1cb351d7729cc1a0f6b
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 11756 bytes
SHA-256: 28c7f5755a78715691c89a9990b00088799aa3173ec22c2b5b726993ad214197

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