Malicious PDF — malware analysis report

Static analysis result for SHA-256 f752ff437dfa975a…

MALICIOUS

PDF

76.6 KB Created: 2021-02-21 04:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3aedfd0c35a7178a72c1a4c20f29e6a4 SHA-1: da68a94ff7b38a49a71de89be9512462a40be455 SHA-256: f752ff437dfa975ad8242d26cf70a633c0011a6b169e08b94fd3ab9ced25196a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=waldo+sweet+and+glenn+knudsvig+a+course+on+words PDF link annotation
    • http://secret-empire.ru/micrometer_reading_exercises_with_answersytt36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387938/normal_5fffbc54df678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60155d02de063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fd92b1f33a1e.pdfIn PDF document text
    • https://baxiboxizalitif.weebly.com/uploads/1/3/3/9/133987723/xaluzatobaxusu_fonanagageboj_xibarekulas_ganunumifobi.pdfIn PDF document text
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/c164b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_600c1a8e3aaa3.pdfIn PDF document text
    • http://xsafak.com/11651171387gl3zs.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/vezejavajofopuv_vufexitajo_jofef.pdfIn PDF document text
    • http://mainsale.pro/70155158110yecmg.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/gibolomosuwa.pdfIn PDF document text
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/9303923.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
    • https://s3.amazonaws.com/wupiwupiwot/dg_vaishnav_college_arumbakkam_chennai_application_form.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_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 5216 bytes
SHA-256: 57126a1d2af1e875338c485347b80b0f2a79b8c92d102ab14e16b2ba1f24ee0a
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 11184 bytes
SHA-256: 6256da5467acb030b3ec27a60c858a6e2f6223a48d806b5613a5290df4010025
font_02_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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