Malicious PDF — malware analysis report

Static analysis result for SHA-256 391739151fd49bf0…

MALICIOUS

PDF

134.3 KB Created: 2021-03-07 23:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e072414c4ae1870ab301d08b3d4e8234 SHA-1: 9cadc6b78caf35a600c09f4aa4ec41b46c000770 SHA-256: 391739151fd49bf071e05bb0e7d051c2e86f63fcf4e6ab88bb75125934bf7719
186 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The primary URL, https://kuzutuzo.ru/strik, appears to be a redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+does+apley%2527s+scratch+test+for PDF link annotation
    • http://roxobupupop.22web.org/97273380984.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/hfynPiR/13062460435.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/tufakexafi.pdfIn PDF document text
    • http://fosupaxutipiz.iblogger.org/calories_dunkin_donuts_power_breakfast_sandwich.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ibijija/missing_megan_gallagher.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_a152ae9a0e7a486098405f142ef496ea.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_85ddb40d50614d4a8c474bc75f4604b3.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_4ddcb2073aa14d91945f913748ff102e.pdf?index=trueIn PDF document text
    • http://nibatozov.epizy.com/adding_and_subtracting_integers_coloring_worksheet.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_57f455a72342454e8b10ae783faa7dd4.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_61b755c3b36e42aca170bf327b8480a5.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_944ca1f5e10d4fba86576e0843ac6d1f.pdf?index=trueIn PDF document text
    • http://tanozetodane.rf.gd/9021964520.pdfIn PDF document text
    • http://terofiwewu.rf.gd/jipigewelenososisil.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_30baa5293b4a498daa694e822db94cba.pdf?index=trueIn PDF document text
    • http://vapovalexuma.epizy.com/ledojepedakepijupa.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_f2c5b61d3fc046428f9439e42d42c31d.pdf?index=trueIn PDF document text
    • http://kaxogesidod.epizy.com/48232039177.pdfIn PDF document text
    • http://xodenumaverap.epizy.com/escape_room_level_30_answers.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_off0001d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D278 5392 bytes
SHA-256: 8eeda2f41fee11ad1ec846bcfabd96d71dd0888c8839de3faa2d75a72f5b3613
font_01_sfnt_off0001e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4E6 11480 bytes
SHA-256: b64605319a4c4825d42a018da7112441edb2d47e05fe75d38a278016a09e3e67

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