Malicious PDF — malware analysis report

Static analysis result for SHA-256 9077ffc65fede694…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 10:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b5c02c8b320774cf8b184dae899a3650 SHA-1: 513843a171ad1ddae81470d317cb4bd9f6784318 SHA-256: 9077ffc65fede694ae576f9dd03715f1391d47851e2eaeab83ce9581bf87c1d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest it is designed to redirect users to other sites, likely for phishing or malware distribution.

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://jottigo.ru/123?utm_term=vitamix+5200+blender+used PDF link annotation
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/nubagidiwaseruridob.pdfIn PDF document text
    • http://regvoolkim.website/malayalam_novels_to_read898ut.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/rugimej.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/jjb4gg1/13362971383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6022be828e8a6.pdfIn PDF document text
    • http://shoop-fr.ru/33292904954w8z7y.pdfIn PDF document text
    • http://servempieza.site/75903097979d310t.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/3835061.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/debew-namamuvo-nakoje-pikota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_6019b3d8a4806.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/gorirofabidesa.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/rezofevujas.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://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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 5312 bytes
SHA-256: e96e9b3837d4e09b7eb496dd6a71049db619f7cfe9265304a4130b615273ffa6
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10764 bytes
SHA-256: daa17e0daefa062cc268d56bc390abfd1954572720a985df4612a8fdd8396911
font_02_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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