Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6dba1e9e3fb542…

MALICIOUS

PDF

78.9 KB Created: 2020-12-20 10:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8922efb458a0c3a9156d99ddb917833e SHA-1: b9f35131ed270eaaf75af2abb580828082f0fcfe SHA-256: fc6dba1e9e3fb542de2ee2fcb7533bbad7be54ae78ef2f2094db026b07c43a93
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document likely used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://traffnew.ru/strik?utm_term=march+is+reading+month+2020+theme PDF link annotation
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/600d33e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_5fa9038153535.pdfIn PDF document text
    • https://vijipivefewari.weebly.com/uploads/1/3/4/6/134624644/6295021f501.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/zaxopamumini.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/nadorobirupam_pibumeb_ziregipowuf_govinazov.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/revifimas.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/pejujebesetix_kujod.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/ec432d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 5600 bytes
SHA-256: 9f6e82b1b795e84d5ab02451442bbd6f0f5a653d09ee9e601585e63f9c33cd54
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 10796 bytes
SHA-256: 3c6ee5ce8972c8924df3ad29cc0765bda8422c88f7afc873b27d3a839a3353d2

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