Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c76ec8dd0b6b565…

MALICIOUS

PDF

70.8 KB Created: 2021-04-04 09:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c2ac7aeeb43e6331f6959032d9c10cc SHA-1: f2ea381bf37674ab5a0c89095912587f0e0fbf6a SHA-256: 4c76ec8dd0b6b56517248f8249705c4e8c2a9236d25a12aadaaac8eb7decd72d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The embedded URLs point to various PDF files, likely serving as lures or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/award?keyword=ikram+antaki+el+banquete+de+platon+pdf PDF link annotation
    • https://cdn.sqhk.co/rukefazox/ifgeGjj/ice_cream_rolls_best_stir-_fried_ice_cream.pdfIn PDF document text
    • http://gotedez.22web.org/jupigipuribo.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/pedagogia_definicion_autores.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/busesepepisinu.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/felem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_6056e559275b3.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuravaxoxi/8hU4iaF/daytona_international_speedway_weather_report.pdfIn PDF document text
    • https://jezosodakadofa.weebly.com/uploads/1/3/4/3/134376186/wawonaralejopaxijug.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/cl4idig/kajuvujujobegikik.pdfIn PDF document text
    • https://cdn.sqhk.co/torixugajo/ibsI6Dd/fun_words_in_spanish.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/3079404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_60053b8f75bb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_c245e1ce49074ae59e2a0024579bb947.pdf?index=trueIn PDF document text
    • http://towirasoruxapob.rf.gd/ancient_civilizations_of_africa.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_d35c9adb476a46a3ad6d558dc48a1a12.pdf?index=trueIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_bc2671c99f894b4db49d4d5dc42d55e8.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_098e314012414ec4b17f81198c2f3c5c.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_61c048e8e2f147e19d54ec4fb7067596.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 5276 bytes
SHA-256: 0fa3b86ae7b3866797055351bf96a24faf49a90d99d4b7eef7e39206b3f04186
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 11480 bytes
SHA-256: 71a60145e51a605f972d23aaf964870c5da4bcb1f6f45bae4d1d5fb0af5a98f0

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