Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5173ef9e0f979eb…

MALICIOUS

PDF

76.9 KB Created: 2021-03-08 11:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e89ec1cae5cd655d447ac68da36680e5 SHA-1: 694cd936554eb2e0574baea6d14fd59adb934d37 SHA-256: b5173ef9e0f979eb807a40c7bb405f14f652864d0117cdfb9fbd6a2892be14d5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/wix?keyword=jio+4g+voice+apk+mirror PDF link annotation
    • https://cdn.sqhk.co/rizijuwet/icBQjj0/85365226413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5fc837212216e.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/what_is_the_main_cause_of_gang_violence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_600ecb1d366bd.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/gighRif/billie_eilish_images_smiling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_603579c64168f.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/alto_shaam_halo_heat_error_codes.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/which_college_is_best_for_mechanical_engineering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_5fd32daf61938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/873fed16-bd20-435c-a0b6-65d793be22b6/how_to_set_a_hunter_irrigation_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4d30a8-d66b-458f-ad06-14a900d903e1/bixevit.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/washington_state_university_football_coaching_staff.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_f9d5ef99fcab4bc1b51efa9e00b7ce70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71601849-4a6b-43cc-872f-e50ffc1e92b0/gatesakisuzezetofep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3311885c-171c-4194-a7c7-ff9d4b6cd18b/nipelonifevasole.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_60e216c904b64c0fb20ddfc519911d72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efa5ff2-bdd8-4544-927e-6ce010a24a90/harley_for_sale_near_me_craigslist.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_fcd2afdad407453ab9b5ac6b32628392.pdf?index=trueIn 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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 4844 bytes
SHA-256: 28ad50c5a47445020d8d7340761e912f6a3049198e04b58d7169977324382ed1
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 10184 bytes
SHA-256: e0b6c452bc9de51137190bc40f7c1de88ba77d8cbde017dd1a4e4f9f5452a7c7
font_02_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176