Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cb0e158e2778f2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 23:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd859051cd7d7329240ee117040828b5 SHA-1: 4612fdadb82f2abf7a9987c860fdd75f73db6d56 SHA-256: d5cb0e158e2778f2c9648764615805b7d4b0f3ae24525cf7946103f519be1b2e
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 and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting, suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://philabc.ru/uplcv?utm_term=locker+codes+ps4 PDF link annotation
    • http://hmconcretemixingplant.ru/d/files/ganotofewipumalejetireku.pdfIn PDF document text
    • http://slovoveri.org/userfiles/25828918830.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/98623375818.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/16301347748.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/41601729604.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/pexiwipujataxadomexup.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/xasutifurobepenelu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/sidojiw.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/41806559032.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/poravud.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/mizoxu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/95135076870.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/15280777303.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/bazidezozevepem.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131626a5d4db---123461180.pdfIn PDF document text
    • https://baongochoa.com/upload/file/tabelewumuwitud.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/nofonesobisinetudeva.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/gexebo.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/sexapapiluxewejumowakafag.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/xofudigedizudalax.pdfIn PDF document text
    • http://stylekd.ru/files/voguxiwopomowuvirara.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/selakiwo.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/61697209372.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/wezalitedito.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/77817047961.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///12212282045.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 19308 bytes
SHA-256: 9108e2a523df8cee5926db6cbff8c3ef2b075b3ef0ff15b6ef93df8267655661
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 10132 bytes
SHA-256: 6b5de130c07a45f6392e625af31fd2f589fa21d9bf4674be3ed4a932e56427dd

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