Malicious PDF — malware analysis report

Static analysis result for SHA-256 736267d0c5a35761…

MALICIOUS

PDF

74.0 KB Created: 2021-04-02 18:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ae45e1f69bfd5e02be2ccf5a21fed4f SHA-1: def58d48496726207ae16c0b63c15f30bd944338 SHA-256: 736267d0c5a35761146c689e41e5a45fb6b472dec3ccf49e683b74e0cee2cdb0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with a significant number pointing to potentially malicious domains like 'bologen.ru' and 'trysoda.pro'. The document body, though heavily obfuscated, contains keywords related to the linked URLs, suggesting a lure for users seeking information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=sinusitis+kronik+adalah+pdf
    • http://trysoda.pro/9590279431656dne.pdf
    • http://hookup682.site/56236523132qc8g3.pdf
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/fakusul.pdf
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/2100434.pdf
    • http://potolkilife.ru/john_lewis_bed_sheets_kinglqy7g.pdf
    • http://cz-nitrof.website/what_questions_to_ask_in_a_vet_school_interview9c5o8.pdf
    • http://bestrongbyg.com/62749789554pwn3d.pdf
    • http://tixshopclub.fun/my.hrw.com_personal_math_trainerlmu1v.pdf
    • http://teatr-art.com/fibosotujutamaripofajeg7lv3x.pdf
    • https://tunilawogipafex.weebly.com/uploads/1/3/2/8/132814387/segonapagobis-nosirepijid-kexunaf-foges.pdf
    • http://health-top.ru/81688283921xelia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulujono/cant_stop_wont_stop_nyx_powder_foundation.pdf
    • https://uploads.strikinglycdn.com/files/9b69bd56-8588-4450-abad-2821e61cc1ab/blacks_law_dictionary_definition_of_american.pdf
    • https://uploads.strikinglycdn.com/files/48e5a55d-2607-4ca7-ad61-50d068935bdb/worm_empire_88.pdf
    • https://uploads.strikinglycdn.com/files/bf1b7fdc-e44d-4c90-bcbb-dd7449ba2080/how_to_get_into_gerudo_town_ocarina_of_time.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_7d1e7d565162471d9782d7d618604d09.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_95800503f33843f094afd5511727016a.pdf?index=true
    • https://s3.amazonaws.com/nemafu/37592420607.pdf
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_b7bbd4bfc92f4a4095c4371861442d27.pdf?index=true
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_440f7ac660e74d6aa99c269d3894f843.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3caa2b45-8169-4cb3-996a-98c5c4840a0e/nyx_cant_stop_wont_stop_concealer_color_match.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_off0000e4bb.bin
36efd741683beeae49bfee3ab16d802d6cb789be279334f213792e0e9261e1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 5296 bytes
font_01_sfnt_off0000f6b8.bin
8a061c0e202ba02288ae87e052382998206903121b384e0cd662953022c25b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10588 bytes

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