Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a9f62a58ace21…

MALICIOUS

PDF

172.1 KB Created: 2021-06-10 13:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c06e00a99646788ec231ef45f4f55f8e SHA-1: 051dc837af056927c5f500e8ec5cb92d32d44ff6 SHA-256: f27a9f62a58ace21a19a66ab587421442126927ea32ac1ba5d6dcd23eaf3e65e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The primary malicious URL identified is https://irlanc.ru/pbw, which is likely used to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/pbw?utm_term=sao+alicization+war+of+underworld+ep+6 PDF link annotation
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/84426e146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_601afce0b5046.pdfIn PDF document text
    • https://mudepazenanaj.weebly.com/uploads/1/3/4/7/134765609/083c0793302.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/votaviz-nukewabeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467030/normal_6034ce320cef8.pdfIn PDF document text
    • https://xodalolekuxol.weebly.com/uploads/1/3/4/1/134108590/fevatud-ratunizaz-sotimowuwoviz-fuliwoduwudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480174/normal_5fd0909847165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_601d85de7944d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_6011abbca546e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_5ffb8a40ee97d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be2e9eb-6d6a-42a9-96db-3c68257c6fd9/jomidekesege.pdfIn PDF document text
    • http://votekotokuz.pbworks.com/f/kinefejilesor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f307a51a-6c7f-4123-9d6a-0faf2e5bc6a5/jamivumilodoxekudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20aa0712-ab43-4210-ba31-a2b0a5c7f747/telefone_do_bradesco_seguro_auto.pdfIn PDF document text
    • http://juzifezazuk.pbworks.com/w/file/fetch/144884904/debut_nch_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5405bf82-8ad2-4889-99f1-45a7958125c1/fisher_price_rainforest_friends_deluxe_bouncer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aef1cd4-e110-444f-9d23-d56bb8059c54/jivuvomuretagorusinon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad99c124-03b0-4c0f-9996-32003c524d19/detaxofozilevedipopelebot.pdfIn PDF document text
    • http://vazexetuv.pbworks.com/w/file/fetch/144774630/74654843196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25cf920-3c51-4fce-8f0e-b4c4f744cf40/vibimerenemuwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410d11a3-df7b-492c-8707-5724fabf7474/11384647617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904c180f-dc63-4c76-8e90-1c6fe1e745e4/34532821820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c04c731-abe5-45b6-b444-8cbccaacaecf/bazumadobevojuva.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_off0001dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFDB 44792 bytes
SHA-256: f11af38ecfddaae45b114f924ca0098894ec1119f42b82ebd3c53f480f97bb42
font_01_sfnt_off000268da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268DA 5372 bytes
SHA-256: 742e18fe7499a5cd36d4cf5a7ca3f54332b987eb5e0146c4511e2d3a6cd3a563
font_02_sfnt_off00027b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B48 11712 bytes
SHA-256: 08c08af5427aa86d36428f13cc748472a6f1c5b1782bca6be2dfccdb87c1aa4d