Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cbe67a82c987e5…

MALICIOUS

PDF

77.1 KB Created: 2021-05-24 07:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32c07b2cc6aa6a2e0c625c2931802d1b SHA-1: 7b0ca3a2bace04e03448f568612d98d603dfb291 SHA-256: d2cbe67a82c987e5d0a8618ae7c5de0dc6df9b9c97d354d54eecbf6e11d39b7a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, including one pointing to `midufefew.ru`, suggesting a phishing or link farm attack. The document body, though partially garbled, contains text related to the nervous system, likely a lure to disguise the malicious intent.

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 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.
  • 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://midufefew.ru/strik?utm_term=what%2527s+the+difference+between+central+and+peripheral+nervous+system PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5ff195fae02ed.pdfIn PDF document text
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/355064423b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_603d713f7289b.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/xoduk.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/1590869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/612dbe87-a90e-47be-9535-e098d662fe05/towaxilunamanuxibawelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3996f978-c56e-4ede-9b6f-1da186ed3914/rixesato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ca5668-0bd4-4340-9c17-06bf39a4913a/girl_with_the_dragon_tattoo_2011_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/59877396736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca12d21-524b-4e33-b2c3-5daa873e412d/wudimoboxebigobajumonunu.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/mimibilotakagawuvixoma.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/compound_complex_sentences_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a6bfd1-2fb7-40e4-a952-10719f82d764/nofetojokuborusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc6e559-89cd-4391-b319-545358ddd510/portable_pitching_mound_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebd98cd-c4e2-49f0-98f6-fc10ac439704/muvajakofuzaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6800f4-8631-428c-9f77-c0d211f4fa1b/tc_electronic_polytune_2_vs_boss_tu-3.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/how_to_set_time_on_capello_cr22.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/hand_beaten_copper_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4450599b-8b78-4e67-8fcc-382192f62d4d/windows_arrow_key_shortcut_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb7c6c7-3704-409a-8a68-ed37021b8417/89956801858.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 5836 bytes
SHA-256: ea9b1775188c211b64c464c016c718e481e44961833bac3d2d42406c1ef805a8
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10552 bytes
SHA-256: bce1e4578e0ef9f68672eed65b77fc831d58945c8b0a6f720557dfa98a90c281

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