Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34fc8c79d818395…

MALICIOUS

PDF

71.8 KB Created: 2021-04-05 15:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2d2d0d97bb23b2cd4684e00e17818bef SHA-1: 4eb03d0c00a6416ad3fba35aa82f0e90ab5b1bc6 SHA-256: c34fc8c79d8183951d0567718be189e4b5b4c639a82a295e5115aebfbf467dc8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior, and the ML_NYX_PDF_MALICIOUS score is very high. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

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://dugedepap.ru/wix?keyword=introduction+python+3+pdf PDF link annotation
    • http://bikelumonekodex.mygamesonline.org/40940380665.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/nivozelinazolofarenuzezu.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/bigger_arms_workout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_606aaaf3847d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6049f3c633632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5fdc24da2c89d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6012d010a68c9.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/picsart_collage_maker_for_pc_free.pdfIn PDF document text
    • http://manekobe.22web.org/judutelepuwed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_603f3ad108047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5ff4dd05180cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bafuwujix.atwebpages.com/tufifivas.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d90d84394e9e4b29a1015b4d7dc6f03c.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_926487aa6c6c46abb662ca15190f52c1.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_dae3c09baf77443a85b0e41183f702ce.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_6690d25112734b0ebf34d24927f7c680.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_c6f97ba9bd1249fd8f6c1c475a903075.pdf?index=trueIn PDF document text
    • http://tinuzutajalik.epizy.com/wilojusubofud.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_36fb077f7cd74f6cbf486490fa168a42.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_48eee6d414154b339c69e37c0b021e67.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5028 bytes
SHA-256: 5deb8e053714556bf2871c18ae4c0cdfda846c2ea1401bf5849addef3a7a2de1
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10276 bytes
SHA-256: 42217b5e98ba45d6dedcd39b2cf30af6d7e978a44f556b8060484e5f9faf1f48

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