Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec9d18f4194210a…

MALICIOUS

PDF

68.9 KB Created: 2021-02-26 11:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0d4fced679e12b8288ed953eeed68e3f SHA-1: a63db79ae12a21e4f608480bdb6159ef73abbec8 SHA-256: cec9d18f4194210a7a40fc0c08158074e89f5b978047415a7ad2714d74a28039
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services commonly used for link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious 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://pelibifir.ru/strik?utm_term=how+to+structure+a+d%2526d+campaign PDF link annotation
    • http://todayit.pro/60702870335nwuxk.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/7fea7f77ed.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/i33dggv/zekedejiwesuvubuxigurivil.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/dadolazijo.pdfIn PDF document text
    • https://titevajap.weebly.com/uploads/1/3/2/7/132741099/5516266.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hhdgdie/tujavuvig.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/winupupiposal_vakanujanavox.pdfIn PDF document text
    • https://rafunipigadim.weebly.com/uploads/1/3/1/3/131380466/8be73a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_60015f481a0c2.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/ximopejigurir_tugapuvufopogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafadogalepe.rf.gd/zebogekamebu.pdfIn PDF document text
    • http://dedetepejoxele.epizy.com/preposition_worksheets_for_esl_beginners.pdfIn PDF document text
    • http://kiwozoma.epizy.com/bahut_pyar_karti_hu_ringtone.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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 4956 bytes
SHA-256: 22cc18f16d9eea09cb88fa61774ac185bfb79f60b6a50ba16e0c152e7ec3b717
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10408 bytes
SHA-256: 12246440d7328d29617b32a9f6fedc5e146f6fefd20f9ed57a693184b68a4dc9

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