Malicious PDF — malware analysis report

Static analysis result for SHA-256 115dce4a37f5a0a0…

MALICIOUS

PDF

92.4 KB Created: 2021-03-20 03:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 358910c9c3724abdc18b510d7b127c72 SHA-1: 47b9610c189eb9a1ae111c41034dd7918e296392 SHA-256: 115dce4a37f5a0a0ad097c0ea9455879cc306a64f2b93651ece883c3cecd2dbd
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 designed to manipulate search engine rankings or redirect users to malicious sites. One prominent URL, https://vilenefex.ru/wix?keyword=fight+list+answers+things+with+a+key, is flagged as unknown reputation, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://vilenefex.ru/wix?keyword=fight+list+answers+things+with+a+key PDF link annotation
    • https://cdn.sqhk.co/vimerokil/cgfhgjn/xagoxif.pdfIn PDF document text
    • https://cdn.sqhk.co/nonagidux/cvTtEQw/gipifidorekewojokuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_3797b6cb890a4f6fa383353aa0230eb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/gramatica_basica_del_estudiante_espanol.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_8b38e0f82d4d443082307fba5ecbfc10.pdf?index=trueIn PDF document text
    • http://kepofif.onlinewebshop.net/how_to_read_23andme_results.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_9ef14f99d896403888f6d6118aa3fcaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusagi/what_is_the_meaning_of_the_word_etymology.pdfIn PDF document text
    • http://tavaleke.epizy.com/best_love_ballads_of_the_90s.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_7794ef2ba3d045d3861178df6a9028d5.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_e2266bfed46149a390c028819b44dae4.pdf?index=trueIn PDF document text
    • http://natukifuza.atwebpages.com/adoption_papers_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/roland_micro_cube_bass_rx_bass_amplifier.pdfIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_755f78aac02141b482a4e0235d967ce8.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_f8a5a93ddd2844c1b5ec837bf0cf0674.pdf?index=trueIn PDF document text
    • http://femodizabofowu.epizy.com/bumamuwu.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_422f21f7e91046b0b43bb653f7bea3ac.pdf?index=trueIn PDF document text
    • http://dujawupiraxep.rf.gd/12068509221.pdfIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 5372 bytes
SHA-256: f700cd8c4a9bf79425bd0c4db9ef2e59b57193833c91c1370955f86c5ff83e36
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 4840 bytes
SHA-256: 4ed3a211ccccd77b3bb2896de3e90d9caeca224e9b460712f7f0c194c6abc6cb
font_02_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 11664 bytes
SHA-256: 16b658e440e8431f47c997d2dcab1b68fac817ce0bf90f0def3cf123f3861354
font_03_sfnt_off0001404b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_04_sfnt_off00015579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15579 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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