Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb7a35e2b47f73d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 18:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: be075b3073bbfc2fcbd6073b7d636792 SHA-1: 58c08c9702a0a568ae06cd5248aa86eede2f0e13 SHA-256: efb7a35e2b47f73dcf6324ef3e7be41b89153954415638af5f44ac8216bf068b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to employment templates, which is a common phishing tactic. The presence of external URIs and the ML/ClamAV detections indicate a high likelihood of this PDF being used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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=employment+grievance+letter+template PDF link annotation
    • http://kiteleminokovi.22web.org/atlas_of_human_anatomy_gilroy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5fcc5ae6e107f.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/dofiwezenirekivogepewoj.pdfIn PDF document text
    • http://kukogekaw.sportsontheweb.net/blueprints_psychiatry_6th_edition_free_download.pdfIn PDF document text
    • https://redobikarus.weebly.com/uploads/1/3/5/3/135396910/figojixav_kaguzip_taxejulubipox_xaruruwode.pdfIn PDF document text
    • http://nuxefigemotak.22web.org/fuvujowurigexolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5fcb1b53e9dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_601de5cb7109d.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/vilodafe.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/chemistry_test_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fff42be6a032.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/how_to_use_a_nextbook_tablet.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/90601905971.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/which_myers_briggs_type_is_the_rarest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_601b2a28c8101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newiroxupamorik.rf.gd/christian_funeral_program_template_free.pdfIn PDF document text
    • http://binawojojin.epizy.com/fasufixeboreramatom.pdfIn PDF document text
    • http://tanonarimunal.myartsonline.com/xuruverow.pdfIn PDF document text
    • http://sebilazog.rf.gd/what_is_the_highest_score_you_can_get_on_the_exit_hesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93fc5c6-cbd9-45aa-a0e0-5d96ade72537/msds_sheet_for_clorox_disinfecting_wipes_fresh_scent.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/xibalimirumatuzaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252f87aa-ab08-46eb-98b9-ca0f76bded7a/wamixijabakowedewojuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa335df6-c643-4d8f-ac83-768b773e8acd/92386311672.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/boritifimemokigusas.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_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5192 bytes
SHA-256: 3b2e8b03c1b7ad22e76695cb0a0736c2e103d0bc6fb1136a0496916a4865cfec
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10064 bytes
SHA-256: b3231d45f6251867bc4bb95d7701758a2e6829cb8d8559d6499f465189335c9d

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