Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d585dd1a4aa16f0…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ea430aba012f9b01ec71acfbe6a6914a SHA-1: aa3ee24a8b6065450b71caae1bd0cd177d0f83a8 SHA-256: 4d585dd1a4aa16f0aafc0ddf6e64db454cc47683e7b4e7d154a2b8c30db3bae1
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating the presence of external URIs and embedded URLs, with one prominent URL being https://seumenha.ru/award?keyword=citric+acid+cycle+pdf+download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=citric+acid+cycle+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416136/normal_60355a0f7d6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_605b19a14f3a0.pdfIn PDF document text
    • http://tryici.xyz/558984898490i2ip.pdfIn PDF document text
    • http://straponartist.com/29408000530nfd9e.pdfIn PDF document text
    • http://afracheat2.xyz/kurupadupozirovufatvg250.pdfIn PDF document text
    • http://poradoit1.site/79180456905pp6g6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_601a109e5a6b2.pdfIn PDF document text
    • http://grenkasalo4.xyz/40736072368k1gem.pdfIn PDF document text
    • http://zuvels.xyz/asme_pcc-_1_appendix_m7kwn5.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/dapuxewetisisedagad4yn4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5ff77b98476d7.pdfIn PDF document text
    • http://nuveclovet.xyz/mixcraft_8_free_downloadex1o6.pdfIn PDF document text
    • http://tikovg.xyz/the_lord_of_the_rings_the_return_of_the_kingml6c3.pdfIn PDF document text
    • http://instofficial.online/61569344279b47qr.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/wunupalezozerud/oracle_database_on_rhel_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/can_you_keep_a_secret_full_movie_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/63978128621.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_4daee1954d314a61846ea85b6b7c485d.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_98d9fe1f65474f9a9a65f28d75263eae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/linked_list_implementation_c_template.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_f5612845594143d1b0d243ecbc89c084.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5072 bytes
SHA-256: 22ed04c4174e780de2b780f100c904d38bb4f38365b0839d4150c4232f11cfa3
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10656 bytes
SHA-256: 1b875943674fafd948d6f9584018f88a1dc5cc2195b189c5402d783b746936b2

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