Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e75891a852f46d8…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 00:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 75228f930c4502af78f4ea2090f58c3b SHA-1: 8d62f82955b5ec67270cbfb7b1a65d6b2ea65506 SHA-256: 2e75891a852f46d8339fa549e12b17fb186c151aa87b033762086bb4e2e6312b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://jumiwimov.ru/123?utm_term=dictionary+app+offline+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fe6513ba7bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_60293fca90587.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/tikadogefaradureki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_600a636a24893.pdfIn PDF document text
    • http://nefupanono.mygamesonline.org/alteraciones_de_la_conciencia_psicologia.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/nifidanifof-kigizotup.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/37659529546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_602219b9e07b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/bosutituladolidukuvuf.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_3cdd86b5df4545d98308e556d93e602d.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_db91c8b97f0b488186608b23b1593037.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e781f16c-9c34-46b2-bd88-b28ecc9da7c0/my_cloud_macos_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c25494b-9bcc-49d6-8ddf-9980baa2da9b/tp_link_tl_sg1005d_v8_0_switch_ethernet_gigabit_5_ports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1d907d-ca93-44fd-b5d5-e7f3db46a4fa/historia_de_la_lengua_espaola_rafael_lapesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d5abe3-635b-4ed3-9c21-cc4e70d8174d/amazon_senior_machine_learning_engineer_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/honda_civic_auto_to_manual_transmission_swap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46062da7-b066-4b9c-8a47-dba6d33fee91/dsc_pc1832_installer_code.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_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 4996 bytes
SHA-256: 44ecaba1ef292627cf4e4a9c4eb218fa074f53e3350d11b3163c91ca69827809
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 10460 bytes
SHA-256: 196ff349ae0efddda7eed1856b900c5ad6ec47458eeb61e292255d0670ada3d1

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