Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ad5456617c5922…

MALICIOUS

PDF

118.4 KB Created: 2021-04-09 01:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08ee9ea951af8a64fb8130b6ccfd75a5 SHA-1: 58ebf16c24bc0bad872b288d7187ce3e682af84c SHA-256: 31ad5456617c5922966de4aa8536e3a7be40350352c9cb3f98623b0f70bf42bd
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=the+expanse+season+2+episode+6+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383295/normal_5feeb68398388.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/boresewitupaludaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/jejfjeo/magic_duel_deck_heroes_vs_monsters.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/what_makes_an_argument_valid_in_logic.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/61779579625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_604e6b08c967b.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/9hb2ide/juweduz.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/jasedesepapisivorup.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/55797691843.pdfIn PDF document text
    • https://poxefapujo.weebly.com/uploads/1/3/5/3/135312596/de5ad7a.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/gawalid.pdfIn PDF document text
    • http://ins.expert/factsheet_maken_voorbeeldm76f8.pdfIn PDF document text
    • https://tepiduti.weebly.com/uploads/1/3/5/9/135974730/bukilubow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_60082dea59962.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/able2extract_online_to_word_converter.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/h7Jgfkt/kulovuwinuboxonidamatugar.pdfIn PDF document text
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/wokuduseta_moxuvuzomikorew_jesabeti_mikojepejivizik.pdfIn PDF document text
    • http://maewallace.com/33963669525fxch0.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/IDagdxP/tafodupojatuvemideja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6019045d8fac4.pdfIn PDF document text
    • http://trysoda.pro/polaroid_sx-70_sonar_repair_manualor96r.pdfIn PDF document text
    • http://desawigoxikugaw.mywebcommunity.org/anatomy_and_physiology_of_the_heart.pdfIn PDF document text
    • http://tehnotop.site/60541407429qbwes.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/temporary_anchorage_devices_in_orthodontics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_606dddffb22b1.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/0cJjiic/ates_ve_su_4_friv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulamiji.onlinewebshop.net/8th_standard_maths_textbook_solutions_kerala_syllabus.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/23060343679.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.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_off00017cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDA 4520 bytes
SHA-256: 8d5786cb40904b1b199b3883430b3f86d3f2c56f58a17eb3ffbc66317fc27ca2
font_01_sfnt_off00018cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD6 5316 bytes
SHA-256: 6b2b68544f1415c27b07510536aad394397e0152869d5e3b6a472c8060f93008
font_02_sfnt_off00019eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EEC 12896 bytes
SHA-256: 665584fa122e65fa3031e7a2a62231e0782059b84497cdb66696340f146fa4de