Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d78afa19f0bf12…

MALICIOUS

PDF

67.4 KB Created: 2021-02-15 04:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f83907d5f63f7e2a8773c61e475c8bb5 SHA-1: 4ca5a63ae4fa6d22f4e2ab97b97e8c1216623a3c SHA-256: 27d78afa19f0bf125b550902c75c0e619cff57f1211b1d74efaac79c2d94b859
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The document body, though heavily obfuscated, contains text related to 'John deere grass catcher manual', suggesting a lure to disguise the malicious intent. The presence of multiple unknown and potentially malicious URLs, combined with ClamAV and ML detections, strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://leonvi.ru/123?utm_term=john+deere+grass+catcher+manual PDF link annotation
    • http://vatamulejuvovi.22web.org/3163702571.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/85648a.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/wukebividewowe-majakawakixasa.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/lurutopobi/48524750464.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/95397487585.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/53368597858.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/48458204234.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/jesugizalabudufoguzobitib.pdfIn PDF document text
    • http://wuduzinemaz.rf.gd/88469979029.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/dashboard_template_bootstrap_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/1521692642.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/arabian_nights_1974_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/pomapovakekofifunatisowas.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_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 5340 bytes
SHA-256: 7febf6f96cdbf005274f16f0829ab5cdb03aac673654ca35b388791b3742e06a
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 10248 bytes
SHA-256: 60e72448c77f677e3f9303577b8b42356d89d2c43895c004d23ace66b2a013a5

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