Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf62df57299bd978…

MALICIOUS

PDF

102.4 KB Created: 2021-02-28 20:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e864654c2649a5e256eb986c1c40a015 SHA-1: d41ab9b848de88e698950087eabca52236ac0b55 SHA-256: cf62df57299bd978ec654afe01045209936c94dffc1ccd5fb19dec5e0d3fc6d4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=kishin+soul+eater PDF link annotation
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/lagodenifivit-tuwelotusa.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/5803425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_6019f4c75637f.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/5a7d2ffe5532e75.pdfIn PDF document text
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/6248728.pdfIn PDF document text
    • https://rukupapafi.weebly.com/uploads/1/3/0/7/130739745/rudazixudipe-puditiwopu.pdfIn PDF document text
    • https://dopupuwupexiro.weebly.com/uploads/1/3/0/8/130813117/4552566.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/rama_judicial_consulta_de_antecedentes_por_cedula.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/suzowuvala_mofem.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/ronuzekudevofu-zinimifuxuzonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konasepobave.rf.gd/chakra_healing_meditation_and_guided_visualization.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/bahubali_songs_malayalam_wapmallu.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/10787045305.pdfIn PDF document text
    • http://vonubopoz.rf.gd/google_documents_invoice_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/playground_marvel_studios_avengers_apk.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_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 17264 bytes
SHA-256: a758ba7fe98c2685acf6d024fd0c4e17b04911400b230f3fc15c4879364f4614
font_01_sfnt_off00015851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15851 4740 bytes
SHA-256: 663ef661098c96dafe27e101b0fb54f330f6385a1e3571dc2f1580c355d9232f
font_02_sfnt_off0001686a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686A 10528 bytes
SHA-256: 8a11dfd040512a07ce8fd99594be5d985d4715b201b49030749e936c48917e8d

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