Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6d9270976a3468…

MALICIOUS

PDF

83.2 KB Created: 2021-05-09 23:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9f0c9281a2b24ad750aaa8623d88e65 SHA-1: 4b13c0fa7ded04943ad9599742f09a5857afd105 SHA-256: 5a6d9270976a34685802f6414f7f48db9d110582c2557b6488cee3e76e193e9b
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely as part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=laptop+acer+nitro+5+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393018/normal_603d8a3c990c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fc87705b4158.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/kunavowixutavomexokodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5fefc687e4987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5ffacef127d18.pdfIn PDF document text
    • http://chambrehub.xyz/30393219751q3id0.pdfIn PDF document text
    • http://braco.ru/9417612724huof8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_601bdf13a1289.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/piccadilly_line_timetable.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/aa2e90c1-d257-4b61-ab58-0a87e3b93f0c/cheat_codes_for_big_fish_casino_slots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5039f1-cfe2-4023-b68a-6bd3f211fa2a/womipal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdae0047-5316-4286-89d5-b16abc579cc4/the_game_awards_2019_winners_and_nominees.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/small_gps_tracking_device_reviews.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/95367545378.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/laboratory_report_14_skull_answers_part_c.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/sportcraft_air_hockey_ping_pong_table_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff2b33c-076e-4905-a73a-654226a3eaf6/84957354855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd08f58-cfe5-46e1-a1cc-d23f2465f678/94224885934.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/63669600868.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_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 5060 bytes
SHA-256: e21d0ed862a4edb21c84e285c7b0fa56b39d427dc01d34b9b75cfe0cf7027399
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 11776 bytes
SHA-256: b95b766d1d49af66263fc2cb160724faac08aa78c47957a9f04c15555092b3ec

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