Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd5761a0f1963ba…

MALICIOUS

PDF

79.1 KB Created: 2021-05-17 04:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bea3eb8ccf95b1eb3ee58d3d8eafc392 SHA-1: 288c2767fae8dd2497675580d41c56edf90ef072 SHA-256: 7fd5761a0f1963ba62e7c099955c47f63fc2bbae5c96a9adf7fc994a8a3e0249
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://seumenha.ru/strik?utm_term=what+is+environmental+impact+assessment+draft+2020', is likely a lure to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • 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/strik?utm_term=what+is+environmental+impact+assessment+draft+2020
    • https://cdn-cms.f-static.net/uploads/4427076/normal_60261e58059a4.pdf
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5ff78ab999513.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/da8626e5263d2.pdf
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5ff5becd84701.pdf
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5fe4ed9d77015.pdf
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/5540714.pdf
    • https://cdn-cms.f-static.net/uploads/4416656/normal_6018ae637b716.pdf
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/855736.pdf
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5ff2837c96c5b.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_603ab35db4325.pdf
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/difagesofopegexa.pdf
    • https://static.s123-cdn-static.com/uploads/4416939/normal_5ffa7a0c9b45a.pdf
    • https://static.s123-cdn-static.com/uploads/4463005/normal_5fef4ae3e2564.pdf
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/dekupijedimejuj.pdf
    • https://cdn-cms.f-static.net/uploads/4474475/normal_60365a8a0aa1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuvepilamamuse/72083835685.pdf
    • https://s3.amazonaws.com/fovezewi/free_genogram_template_social_work.pdf
    • https://s3.amazonaws.com/tokit/18060373831.pdf
    • https://s3.amazonaws.com/fulazelof/kenmore_microwave_model_790.803_dimensions.pdf
    • https://s3.amazonaws.com/vuterijoze/homer_iliad.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/does_netflix_have_little_shop_of_horrors.pdf
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_418a4259bcad43148619f9c9bba45934.pdf?index=true
    • https://s3.amazonaws.com/tobobowu/is_20000_leagues_under_the_sea_a_good_book.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b21a0869761341ef8cfead554ce6293d.pdf?index=true
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_1aa6f82e2bdf43b6b657883e1dcc18f4.pdf?index=true
    • https://s3.amazonaws.com/xukanomarexumu/deformed_skull_meme_template.pdf
    • https://s3.amazonaws.com/nimuwet/almond_meal_nutrition_information.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66a.bin
d18a4ef15f27665a11ab1a2e28b17a20dd3c1a0aa4894a82213b87f5411cd0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 5740 bytes
font_01_sfnt_off000109de.bin
471e35f9c36a679111b6199db879fe1f4d079fdd533945a11725910a7ee00805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10540 bytes

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