Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e777fb70cebbfe…

MALICIOUS

PDF

67.1 KB Created: 2020-12-23 02:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b0d8f3ee9868949b4826883762eb50d6 SHA-1: ef510a951bd9949381db3e2920129d5bdcdcf12f SHA-256: 00e777fb70cebbfeda15fdc49cdc226ab800cdaf864008184f87458260eb1731
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of multiple links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://cctraff.ru/strik?utm_term=basketball+club+story+themed+area In PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/1992068.pdfIn PDF document text
    • https://mazovibodekimiv.weebly.com/uploads/1/3/4/3/134398511/fitelokoda-famajelur.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://sexajegimekudod.weebly.com/uploads/1/3/4/3/134345532/rovuwirobu-lojeveru-wesutudosegi-gekejozorura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5fcc6dc9af1ad.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/7817222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takurugilij/le_cerf_volant_de_kaboul.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/roster_form_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d259a578-3287-4f6b-9eea-255fca230ccb/wuvulogi.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/96914279674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147280c7-e360-45df-a30d-05d20ffe9e2b/63384016028.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 5532 bytes
SHA-256: c09e77aae09610ec434347f3fc57319108e7d2959690ab205eccac11437ff2e0
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10636 bytes
SHA-256: 6543b9f4f6f5f87a20234cf415492b91014d17fe8277e598766b2560fa8e3cf2

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