Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d7c1f5de54c4ef…

MALICIOUS

PDF

81.5 KB Created: 2021-04-30 05:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d86b6dba8feb5f24c948c829e60ff31d SHA-1: 22df16921047d0cd28f804c9b713e0a1cd13c5d2 SHA-256: d3d7c1f5de54c4ef1022d07a9f2e8f86853eb884e92de9a3a701832272642708
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_REPEATED_PAYLOAD_LINK_LURE' specifically highlights invisible and repeated links leading to a payload URL. While no scripts were directly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://botokaw.ru/strik?utm_term=excel+urgent+care+old+bridge.com In PDF document text
    • http://vozivovog.scienceontheweb.net/mechanical_engineering_project_ideas_download.pdfIn PDF document text
    • http://tryici.xyz/dark_souls_3_4_lordsnnrrd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427501/normal_5ff47a8107127.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/pukenijol.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/42277024128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6013f4b27c69e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_604244b23925d.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/how_to_change_the_battery_in_a_dodge_grand_caravan_key_fob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fd7118a9119e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_60114489199a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_604804c60e473.pdfIn PDF document text
    • http://oblakova.ru/nordictrack_a2105_treadmill_reviewzuz23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_6039db6e986d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fe9ca4933ed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5fc68b95537ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_6069d0030cc58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solugivewatewa.myartsonline.com/49132377294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da84e8cc-d8d7-441c-87db-c347e76a3068/netgear_prosafe_fvs318gv2_port_forwarding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3f8a3a-3ff6-43b0-96cf-c33bb584a278/3558775174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45701ef-a22b-4543-986e-02a925698ec3/no_logo_naomi_klein_quotes.pdfIn PDF document text
    • http://dazejifudora.onlinewebshop.net/alcatel_lucent_g_240w_a_manual.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/fesevivobitoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e252c779-bf93-47c4-95d1-fc4d66112e82/mario_kart_wii_ctgp_revolution_v1_03_iso_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7158d5bf-c04d-47be-8df4-3e9036724a98/18609547490.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_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 5280 bytes
SHA-256: d00ef3dee9e78aea19c0b5583b40b359d3646d318afc2833a58949dee4641897
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10932 bytes
SHA-256: 6c23b6bd5d1a5df1a644a67b04e7d66e31ce2e2e5519a7753ba0d9bad84ac076