Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b27f8f42f24e1…

MALICIOUS

PDF

80.6 KB Created: 2021-04-03 15:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b265d8455cc7cbed76403e55430b01d2 SHA-1: 75eb6bc090cfbbc5f567c037d2e4cc600381b220 SHA-256: 628b27f8f42f24e1f15ceb17e5c478d7712c4522b2dc0cfefb6a66a0c07d9ee3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'resalured.ru' and disguised with a search query related to an essay. This indicates a likely attempt to direct users to malicious websites, potentially for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=external+resistance+to+apartheid+essay+pdf
    • https://cdn.sqhk.co/satasevubu/C4Ehijd/police_horn_dj_song_download_mobilekida.pdf
    • https://cdn.sqhk.co/kavonalitego/CiaicOR/diversify_your_bonds_meaning.pdf
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/8300444.pdf
    • https://wovokuvodopi.weebly.com/uploads/1/3/4/6/134685597/25751dde9fa25.pdf
    • https://cdn.sqhk.co/neviragar/crRhihb/ghost_rider_3_us_release_date.pdf
    • https://cdn.sqhk.co/rokajoten/lgjJRAD/85167440932.pdf
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/zagepote.pdf
    • https://bawoxuvebi.weebly.com/uploads/1/3/4/8/134886771/xesawozeju.pdf
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/vovezijawezojesone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dakebesuvum/it_mobile_device_policy_template.pdf
    • https://s3.amazonaws.com/mejobu/chi_la_sow_movie_moviezwap.pdf
    • https://s3.amazonaws.com/wuxupewu/accountant_resignation_letter_format_in_word.pdf
    • https://s3.amazonaws.com/wazotojemov/besukitoxereselizozolak.pdf
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_9d26c27b616d4ece93af5059f7024d63.pdf?index=true
    • https://s3.amazonaws.com/levovod/15312590264.pdf
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_e9ad6ebf92a74f2eb6dea381f11f3c04.pdf?index=true
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_548fd06590e149fba10256cb02beca64.pdf?index=true
    • https://s3.amazonaws.com/ximupuv/the_eyes_of_the_dragon_chapter_summary.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_off0000fd65.bin
5d7b5c2986966a05c9bc30c869032f890297b1eda3ef7d7497cc21092b646f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 5368 bytes
font_01_sfnt_off00010fb2.bin
025c43e18d8491ce64c53afb292355d2a0e894ebe01f26f0a8f5499ec66ff53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 11060 bytes

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