Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd48f86b55412c2…

MALICIOUS

PDF

67.8 KB Created: 2021-03-08 08:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 393741b200ec8e480a67d4d791ab1964 SHA-1: 2a32da9957fcdf0fc691f34e237fdb80bbfb5412 SHA-256: 9fd48f86b55412c27f7855276bbe69c888a3c73b74ec9654535e3cfc41e88cd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://xajibur.ru/strik?utm_term=bissell+proheat+all+rounder+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/nijodujex/ignjcvK/42742648371.pdfIn PDF document text
    • http://ru-1.casa/bezudimalasuza1stub.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/wright_medical_aequalis_perform.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/iDNhgFN/lulolukuxavesekosegejigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_6015c6dd38dc3.pdfIn PDF document text
    • http://parrrtner.xyz/sony_a77_ii_datenblattnmq1l.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hbpjihi/kexerozetazuxixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_600aa8b1a7ad4.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/3TJGhdC/rapunzel_movie_poster.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380211/normal_600108aadb4c5.pdfIn PDF document text
    • http://moekolechko.icu/boxing_star_game_wikizvoza.pdfIn PDF document text
    • http://ditumen.22web.org/leer_la_tregua_mario_benedetti.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/giichgr/joxusokelun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370280/normal_5ffcaa920aec5.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/Ihba5YA/japevajidefozomom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekelelavalu.epizy.com/how_to_play_family_feud_live_with_facebook_friends.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_30b110abd2c24a75a5a79db6552881ed.pdf?index=trueIn PDF document text
    • http://misosemarimo.rf.gd/48009577853.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_7b8f53d3f02442838edaf8bf7aa4caff.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_06cf0847dc1446848e5af57b5ca9312d.pdf?index=trueIn PDF document text
    • http://finuponazed.epizy.com/bigaverimogoratisufibis.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_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 5360 bytes
SHA-256: fde317550984343dfbce86bae861625406c0a6bc322d7b89545cdbeaef40bb6a
font_01_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 10208 bytes
SHA-256: ed88cc5c0263bcb46ae15449787ca8658493580d1d746f814b71125b51fa27a8