Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e1d31fbe8e9bea…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 06:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4e2c128b37fe0c2ec91b368e997a6f10 SHA-1: 81e20a3d49838804cd90668a519d4aaf3cc6afd1 SHA-256: 71e1d31fbe8e9beaba743815f31fbfc7b6ead24670280457bd7ef7a53d9f5961
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a notable one pointing to 'druttle.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the attack pattern of luring users to external malicious sites.

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://druttle.ru/award?keyword=fine+blanking+process+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392452/normal_6005d39dcffd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456369/normal_5fdff2dbaa4c7.pdfIn PDF document text
    • http://life50it.pro/where_are_hermle_clocks_madeil4i9.pdfIn PDF document text
    • http://richteam.site/free_prefix_and_suffix_worksheets_for_4th_grade9q457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_5fd631eb868c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6024bc4de9ca4.pdfIn PDF document text
    • http://azakalaza5.xyz/746312808801uion.pdfIn PDF document text
    • http://muldwych.com/suxiropekedd71r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_60004b9c910f4.pdfIn PDF document text
    • http://agentsecure.space/windows_10_updates_but_don_t_install824at.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_600011e9e82d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_605ab632ab772.pdfIn PDF document text
    • http://pozuliruz.iblogger.org/surezuruzalinilisuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_ae48a4ebf3124959ac73aa3f73425a2f.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_101ee1b62fe4488b9f6592df014c4e40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/fundamental_analysis_course_by_ca_rachana_ranade.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/ubuntu_14._04_32_bit_server.pdfIn PDF document text
    • http://nimunofat.epizy.com/27588725826.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_4753b16494274cb3afc719e58eb5716e.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_f49a878b0c1b4dc3bb9336f1c1cc52f4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 5480 bytes
SHA-256: d7d6f478694f7a9bd88651892db5406960f83254bb424c288344fa62426533cc
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10580 bytes
SHA-256: 156b6c0eb312035c0d39c0b180c05564e4259eaee50b05ba0f76110b0204b9d0
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16780 bytes
SHA-256: 039ebea4a68317714e89113ca221def481ea90dc422e25922226b6b54c7f857e

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