Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc8c2cc0aebd1f0…

MALICIOUS

PDF

67.8 KB Created: 2021-02-17 15:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4e9bef30b4f736fc98712b47c43c1391 SHA-1: 715bd92f1eae7985bd15d45d40d21c71d1d16c2d SHA-256: ebc8c2cc0aebd1f03adfbe54dd88bd87373310b18517a777e11f6d35ca15ad06
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially garbled, contains text related to printer ink, suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=what+ink+does+hp+photosmart+c4680+use In PDF document text
    • http://nimened.66ghz.com/iim_ahmedabad_placement_report_2018.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/36021724450.pdfIn PDF document text
    • https://gikapizuwixa.weebly.com/uploads/1/3/4/0/134097763/susoluxilivaben.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/donarepemi/19592577112.pdfIn PDF document text
    • http://xotebovujuba.epizy.com/gloomhaven_scoundrel_guide.pdfIn PDF document text
    • http://zoxuditavuvov.rf.gd/pobikad.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/fowekuj.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/free_tri-_fold_brochure_template_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/darizetewisijezigo.pdfIn PDF document text
    • http://dijiwag.epizy.com/isaitamil_movies_2019_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/76027649558.pdfIn PDF document text
    • http://boloxevukizuf.rf.gd/avast_antivirus_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 5936 bytes
SHA-256: 77e85e1dc0414e54050357b8c401467d117fdc370d77d7d982698cbb9b229f35
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 11072 bytes
SHA-256: 3357f1e4655de6170e259d40f44c99a99034df9ebd3c07742162461626e3ea0f

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