Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e66a516a6e5814…

MALICIOUS

PDF

73.7 KB Created: 2021-06-04 22:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 04f019865519dbec8df5055475d31a3c SHA-1: e0c66d44efcb3ff73cb2df14b3d643921eadad0d SHA-256: 66e66a516a6e5814cbc3089dd98116348cef53e05f2ce5061ed30e431909da1b
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. Heuristics indicate a social engineering lure, specifically instructing the user to copy and paste commands into a terminal, consistent with ClickFix attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://inwebjor.ru/pbw?utm_term=how+to+create+a+bootable+usb+drive+for+macos+mojave PDF link annotation
    • https://larulevi.weebly.com/uploads/1/3/6/0/136004384/fupinobuzalo.pdfIn PDF document text
    • https://finenomasawovep.weebly.com/uploads/1/3/1/4/131437785/negijeb_lepuxaja_gavam.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/giwodevetum_votavitolok_xabilaxe_zusaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_5fee2ac80054c.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/wejajiramup.pdfIn PDF document text
    • https://linobajeg.weebly.com/uploads/1/3/4/4/134489040/be88277.pdfIn PDF document text
    • https://vavemome.weebly.com/uploads/1/3/4/6/134609594/9101331.pdfIn PDF document text
    • https://kimidevi.weebly.com/uploads/1/3/4/0/134018720/2641879.pdfIn PDF document text
    • https://rizaguvaza.weebly.com/uploads/1/3/4/5/134502188/5191364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd15777638a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_605b3f0733280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144595239/merchant_of_venice_act_1_study_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b4ea03-3c65-4645-8e0e-92b76065c625/modamefediguzazubanu.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/rick_stewart_pistol_wing_t_playbook.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144418140/15246981713.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/f/take_2_tablets_by_mouth_twice_daily_means.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/jidamujopinubeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b18512-bf26-4da8-bcb6-57824fef3b18/fudetazivimumavipasubuf.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/lerudala.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144437499/how_to_calculate_electrical_wire_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 5272 bytes
SHA-256: 82440b843892dfa699a7148a34f3c34d7c98e934eca1a79bfee0a42e692782cb
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10584 bytes
SHA-256: 8fcb29dc25bf76edcbbcbf20e4755d3dc772f45e58f26fb4bc76d1d38a1a4c86
font_02_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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