Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddf147691e46ae6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 21:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b90fb70610b813dab84f0c78ed9c15f1 SHA-1: bc19eec69ee35a59604592dac682041d3d34d579 SHA-256: 8ddf147691e46ae64e88030aa20c8b3c70c6b61b02c8100dc1b5b0850bf0529b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, one of which points to a PDF hosted on a disposable domain, indicating a potential phishing or malware distribution attempt. The presence of a link farm heuristic further supports this, suggesting the PDF is designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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 http://phongthuydotho.vn/upload/files/rosezudema.pdf In PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sezezijunavivituzud.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/52993539844.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/fegipafozuziwe.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/lepajezixilikes.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/gasulegejatomaki.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/42330314972.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614070fe93b8f---gejeduvinowuxewofilulipur.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/2559159343.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jafisuwezapimevibez.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/74127344906.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wosomolirugodipobavaf.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/16234359465.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/wixesalev.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/fafabusifakilokese.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/94543004286.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/basalipimoduxeliriwu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88430637256.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/59470657924.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb046c504---voxolipeva.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/65090957135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=email+subject+for+resume+sendingPDF link annotation
    • 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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 18092 bytes
SHA-256: 31d17e092a6efa9dc44b0797ffa4f6fd77a04f6f28e07babf4518139e6dac9df
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 11172 bytes
SHA-256: 1af61769430281501310bdb007e6a379ec17e5eaffc3f37c18a5b9255e3f3c8f

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