Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dd0056f2611cbf…

MALICIOUS

PDF

66.9 KB Created: 2021-02-25 11:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f3e3e7f9f9d0cbd118d44ad2f9384ee SHA-1: f086827b9d46251de77e9e78f2886f898498a3c2 SHA-256: 13dd0056f2611cbf999a5d527a1cdfc6b72ad53a974212b81532b971b914644b
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, designed to redirect users to malicious infrastructure. Heuristics indicate the document is a link farm and a redirector, with one URL flagged as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+change+a+medline+thermometer+to+fahrenheit In PDF document text
    • https://cdn.sqhk.co/jidulopavoji/hhYhftk/shark_world_hack_ios.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/108d73c870.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/navetaxisazux-raxagapetuza-bozepevitinute.pdfIn PDF document text
    • http://dontbeshy.xyz/80s_techno_musictqwj4.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/whdWIfY/snake_colouring_book.pdfIn PDF document text
    • http://safilow.iblogger.org/wezolase.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/sulobirakufel.pdfIn PDF document text
    • http://lajulufubugo.22web.org/arnold_ehret_chomikuj.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/judurenokato.pdfIn PDF document text
    • http://ersoil.fun/kapulugugajigivata3f08c.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/idgemia/joloxagugufemupusiti.pdfIn PDF document text
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/164e1a3.pdfIn PDF document text
    • http://persequenteamsohbet.com/90016243511so7zm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowulikuvej.rf.gd/bruce_lee_songs_download_320kbps_atozmp3.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/zumutafupot.pdfIn PDF document text
    • http://xidixisugatifes.epizy.com/83588138033.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 5312 bytes
SHA-256: 3bdfb6bdde32bb2566012c610caf72013df7aa44fdf607892db9bfb35cdf6600
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 10012 bytes
SHA-256: 8e11d3ee4e97f5fc215f3776f403ab138cf53a2213f1aa1876114951aeb9f317

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