Malicious PDF — malware analysis report

Static analysis result for SHA-256 0371eab47a95ce48…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 16:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78f8a7a9cdc065cd24bc7d22d8ab29a6 SHA-1: 7f6f8984db1425d9065db2e847a4315d8bab1424 SHA-256: 0371eab47a95ce48556e23fa1cf9e8180d4d47a5fc1618f10cc0e7563b65d0d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://laborke.ru/uplcv?utm_term=why+does+my+phone+say+no+internet PDF link annotation
    • http://muzycznescyzoryki.pl/userfiles/file/jufisosibuwizolavoxomijuv.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/nelogomexabinix.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/63193068823.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109030845139024.pdfIn PDF document text
    • https://ebooksweb.net/files/file/36196608442.pdfIn PDF document text
    • http://haphadoor.com/upload/files/44084078903.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/16238354589.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/24563395353.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/18571655113.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905194706632854yjgc29xe3hal.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/pujorazobine.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/dafititub.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuvadetuled.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/fefobarapo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/bipis.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/fiturodawuduv.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/kanitedabisogur.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b48585950---tupuxelafij.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/26774796180.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/tujotababozabekuvedovap.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/58451099825.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/84334062384.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/biwomozi.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://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_off0000cca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 17552 bytes
SHA-256: 5b195051d203c3cddad8dea8d681c5c94aca3f1f370d19dd48342a48a008d3b6
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10720 bytes
SHA-256: 36e8279b9cccdf33ad20f1d0e148653a2c6f50d07f84c87a9832839a2b90ed99
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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