Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5f6955cebd83b7…

MALICIOUS

PDF

72.6 KB Created: 2021-03-19 10:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 61b42fb635d3b42d7a58f1cc879a1915 SHA-1: f42ba9fa100c856aa55958a8cb085ff0ab5406a2 SHA-256: 9e5f6955cebd83b7eddde498342ff469d33843255af811d70b7c16ff362fff7a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=libro+cocina+al+minuto+nitza+villapol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450883/normal_600fba35c658a.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/LJGbRhg/hakuouki_hijikata_x_reader_lemon.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/eMjisid/sujet_management_des_entreprises_bts_nrc.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/sonaridopojugow_rifuxumu_jexetaxirone.pdfIn PDF document text
    • https://cdn.sqhk.co/vivijuzajus/bK77Vie/jumping_ninja_party_2_player_games.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/4970581.pdfIn PDF document text
    • https://julufima.weebly.com/uploads/1/3/4/8/134884845/gobemejafuvaf.pdfIn PDF document text
    • http://yozi.store/wiligabihypyd.pdfIn PDF document text
    • http://strongcreditscore.info/fekodi9pvs1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_60074c6668a66.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/jfCMFhg/top_100_station_frequenz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5ffbc5ee3da15.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/ibwgeie/90247231673.pdfIn PDF document text
    • http://bluhgang.best/why_does_my_treadmill_stop_running_when_i_get_on_itz2kxn.pdfIn PDF document text
    • https://cdn.sqhk.co/gimiraxu/dzVhdgh/xawuxavodisebanu.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/g9z1F0N/vexudinanikolag.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/R4QJhfl/anime_with_robots_fighting_aliens.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/6386520.pdfIn PDF document text
    • http://exemplpusj.com/berserk_2016_opening_songdisj5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5fedfad39bb94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datidogebe.epizy.com/869378377.pdfIn PDF document text
    • http://sesetufeguvarod.epizy.com/rebuduwenabifagut.pdfIn PDF document text
    • http://tosotagerazopor.epizy.com/hypertensive_crisis_guidelines_aha_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 5312 bytes
SHA-256: a286e6164536166f0069896e2e344c396bb5b8b6dc1311a3f2f7383c2848a8d7
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10580 bytes
SHA-256: d88ca78b84f4d00a778f2eaef6b305e15396d549a86dfdd8c7678c9463685371
font_02_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15