Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec6cc9712ce563c…

MALICIOUS

PDF

78.8 KB Created: 2021-02-15 09:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d1be68dffba992a7b7fb90b5298f7fa9 SHA-1: 63d5a9d41b89f6221b60e44dc7147a20a251e906 SHA-256: dec6cc9712ce563c322505392732fa2dd95917194e1920620989f642aa8e37f6
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The presence of a "download button" lure and the ClamAV detection as "Pdf.Phishing.Trojan" strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/aws?utm_term=ami+bios+update+utility In PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/195ffb79f022ab.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/9416614.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/6475236.pdfIn PDF document text
    • https://soxodoma.weebly.com/uploads/1/3/4/6/134695887/forupawujej.pdfIn PDF document text
    • http://sodaapp.pro/nizipisawubofosofiborovnf3t.pdfIn PDF document text
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/40896.pdfIn PDF document text
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/ropawepuga.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/ZU7hdhc/the_triple_alliance_nations_were.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/titigiwosixad.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/8fb8786c.pdfIn PDF document text
    • http://pewagupudasita.22web.org/32820286380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesinofafag.epizy.com/close_credit_card_account_letter_template.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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 5240 bytes
SHA-256: 36f0f1597ae1fcf8fa4731e2421b9f12036b12d06027a1ba88826acbea6de32f
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 10824 bytes
SHA-256: 1c4285444f0830ddee76647e71801e547245859d58fa49e7de98a6a260304cd4

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