Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fbbdf9d56f27e5…

MALICIOUS

PDF

74.0 KB Created: 2021-03-24 00:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c020e10b1c1e1d45f9bbcf4559cc36f9 SHA-1: 8ff1e4b4daa9a03f88f8d9565c87c21d7641e1ff SHA-256: f4fbbdf9d56f27e59a2de66f0b72773e219bc1585d519bd385c5366a62de9548
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 0.9992

Heuristics 5

  • 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 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://ponafet.ru/123?utm_term=right+bundle+branch+block+symptoms+merck+manual PDF link annotation
    • http://zhigina.ru/konowoz1u5lc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6016ec19064d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_600e0a23c564b.pdfIn PDF document text
    • http://nout-sale.site/antiform_and_synform_foldvjp2v.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/ags_pre_algebra_workbook.pdfIn PDF document text
    • http://negozio50sconto.info/tezegulejole9k85.pdfIn PDF document text
    • http://lovepositions.info/the_secret_garden_london_cast_recordingcnhva.pdfIn PDF document text
    • http://hdvideo.design/sumirodiwetekejenuti2wofw.pdfIn PDF document text
    • http://iqecoportal.ru/wuvepovuxewifir8r4e.pdfIn PDF document text
    • http://bbflowers.net/65572498746odhfu.pdfIn PDF document text
    • http://org-fruit.space/89615285818jt0ld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6055057785dcd.pdfIn PDF document text
    • http://afracheat2.xyz/the_dark_knight_returns_comic_reviewj5q3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414866/normal_5fe1f723d5690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_ed7e6a5f666e40949ea2f3216ba5399e.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_695428b631ad4b1ebf80d133c4e9ae26.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_1f22558ec83c42b689a93de8fa080ee7.pdf?index=trueIn PDF document text
    • http://nononulavojiki.myartsonline.com/2942070163.pdfIn PDF document text
    • https://b1fdf235-84a1-4479-ba44-7fc4a4f983d7.filesusr.com/ugd/afcd87_34d71eb35e194fa7a9f8c5ddc2fdaba1.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_0c893730cbed4af2b0a3a12751e09deb.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_d90c44125d2349069c0cfdce4ea7ff25.pdf?index=trueIn PDF document text
    • http://juludiripo.myartsonline.com/reziwavokofolajepe.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_9c612d028d394bd0896fa25b3e0785e3.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5800 bytes
SHA-256: be8fca138db9ff85dee9753e1ee060841db6be6c3393b0e3e9f94c829a95f142
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10792 bytes
SHA-256: 4bfee50d9b4cbaa4a793d80ead485fe276de6cbc386d2bad242a9d67e8c82791

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