Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0f50413d71d889…

MALICIOUS

PDF

77.5 KB Created: 2021-05-21 05:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4b2db90a38feae275deaae775c26da47 SHA-1: 5b4faffbacc527a0917f41626c99371939549191 SHA-256: 2d0f50413d71d889b38efda5dd8d20858e9c0c708fa8d79c12ea887729c03261
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=can+you+put+essential+oils+in+a+vicks+humidifier PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5ffb83f3a984d.pdfIn PDF document text
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/juzaroze_tevidufig.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/8a0b81b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5feb863f2730b.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/puset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe285d57b918.pdfIn PDF document text
    • https://jigupeditu.weebly.com/uploads/1/3/1/3/131380623/a1b8e4a5af9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5ff94e76eac35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_5fc62bd7a3a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_60497ba68dd67.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/459d47ad-f423-4580-b5ee-18c464f0cad4/ruwabuxezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147d5cbf-ed7f-471c-8ebb-5949b7737935/91723523539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e92324a-489a-41e6-933b-9a6aeef34d8f/delta_baby_crib_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b32475-0615-4b0e-930b-cb78d48588c8/26672370364.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/rirozinetoxekerujagomal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa68d0fa-fa2c-476a-aef4-146774e7e19b/how_to_find_ge_oven_model_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6571290-d8b9-4a51-a656-1413a777add0/canon_mx890_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3345869f-77f0-4294-836c-5843def99f67/first_cell_height_calculation_cfd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8547e4-075b-4574-83cb-a48caa799583/dakewalisepuber.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/blank_monthly_calendar_template_september_2018.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5528 bytes
SHA-256: 6c47e011c5c78b372470c4ee6932557e66550a43389aaba0a8228fb9cfc99c73
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 10448 bytes
SHA-256: dda80ae17d8a302ca520408114f89e59badfbe64aef6ec6daba4f43ac66d245b

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