Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e8b3b07778e38a…

MALICIOUS

PDF

69.5 KB Created: 2021-02-06 01:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 54438f8ed02e27f157425cf379332505 SHA-1: d8ad2c960872d53f478503191f8ac1efb604803f SHA-256: 26e8b3b07778e38af73b0a9ddd5322e5f9d80f21f3311a7e90a3ca4fadc8fcc8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious content, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'update sqlite android', likely a lure to encourage clicks on the malicious URLs.

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://druttle.ru/aws?utm_term=update+sqlite+android PDF link annotation
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/werubiwaxi.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/7dec181b.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/5840123.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/vivavideo_apk_full_version.pdfIn PDF document text
    • https://gojulujowavid.weebly.com/uploads/1/3/4/8/134886085/2535a678258580.pdfIn PDF document text
    • http://qupieasy.online/tafaxipalabiwejogulamur3yx6.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/3861459.pdfIn PDF document text
    • http://sweetygirl.club/gafepozufelapudopezlw06e.pdfIn PDF document text
    • https://lajonomopizu.weebly.com/uploads/1/3/0/7/130739457/09be1a527.pdfIn PDF document text
    • http://vivadoctor.ru/retention_bond_templatean20e.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/dupitu.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/ganubatebedoxez/tropical_rainforest_biome_information.pdfIn PDF document text
    • http://nareboveridur.epizy.com/jimewogas.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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 5068 bytes
SHA-256: 439aaf7bf3fff9556219ecf5a300d57a8048356b347f346a044de96b502e0a97
font_01_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 11472 bytes
SHA-256: 7acd014bfa695a0d3597cec9d09b5e658d9f4f79f1d701af2e3e5944cf269368

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