Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86744656d70d17a…

MALICIOUS

PDF

80.9 KB Created: 2021-06-06 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b156270a7967fa806330e63571bad4a1 SHA-1: 9cd952af1909fbe19bb43cd352032976464208eb SHA-256: e86744656d70d17a8df382ccb56306e1eb54e9a51696b771eb975972fb4079a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=how+to+pass+your+cpr+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5fd852e4e0e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6058cccb19586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipoziw.pbworks.com/f/51840892596.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144592926/vamerijemibe.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144686727/57919905925.pdfIn PDF document text
    • http://lopasexosew.pbworks.com/w/file/fetch/144665400/tamil_monthly_calendar_2019_free_download.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144436281/new_balance_md500v4.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144476973/xefifadeguxemilafabat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07ce601-7207-4844-a7a2-719d558562ab/comunicacin_a_personas_con_discapacidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee74c656-64db-4aa2-b3a2-22caa9e8a77a/bijewitupufap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2614c783-9479-404c-bbca-4f616fb213af/download_cheat_uno_and_friends_mod_apk.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/53278546741.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/52140457050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b480126-ebf8-484f-8141-97fcc13473b9/werewolf_card_game_characters.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144613572/kuwibega.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/69582985765.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/voloxejovejijetamoj.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144575193/13677879094.pdfIn PDF document text
    • http://sidotafawe.pbworks.com/f/74165026797.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_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 5048 bytes
SHA-256: 323c23a539e10ff1beca299e2ca8691bc91703ceeb329150eac246d5823fa84a
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 11524 bytes
SHA-256: bc29037b8ce6af73a808d0e1a01fa5dbf0e6d56285417636f1d3de0cfd6ea27d

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