Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44d9baefd819e13…

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 09:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45a2c58758dc8cfcea6fdb1eac145798 SHA-1: 4f7442489a1b06e324095720587729d90b774d44 SHA-256: e44d9baefd819e1361b89c9a98638b3e8fb9bed92daa36b8939e91bef816ec52
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing attempt, likely to trick users into calling a fraudulent support number. The document's structure and embedded URLs suggest it is designed to exploit vulnerabilities or deliver a secondary payload, aligning with common phishing and trojan delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=horror+movie+with+blind+man PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd5996195---64340850435.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/71933438936.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xonixulixusudole.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///somaxunogirijunoxajosifen.pdfIn PDF document text
    • http://qdcmd.com/data/files/75953009313.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pivavoxafofu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vaziwawot.pdfIn macro / runtime command snippet
    • http://trip-sale.ru/userfiles/file/44664836445.pdfIn macro / runtime command snippet
    • http://propack-th.com/image/upload/File/24312162594.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/kagenipu.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/91830502748.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jabug.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/44148226038.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/264f7803d24c595b6fc765bc3fa7ecc3/pujibik.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/mobaxeteralijugadun.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/keputuku.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xemedagevoduwu.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/53571768536.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/58444444815.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/jilotobewozexesitibu.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/wowumosek.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/55776068370.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xeratisaroseporivad.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/74465079313.pdfIn PDF document text
    • https://svltv.in/userfileIn macro / runtime command snippet
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 18800 bytes
SHA-256: 0f83cb52b6aca1d2c956ba4addb9ad0bc8014747f8e5f4f47624889c626360f6
font_01_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 10628 bytes
SHA-256: 694a6904a342ee4620b921ba8edce29738d3adf8351cfc014f188cdc506b1a49

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