Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb642b933cf4fa3…

MALICIOUS

PDF

66.5 KB Created: 2021-02-25 16:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e73211154f9f5318b0813b4bffbd219 SHA-1: b0b4ef1f32b6ace930a8224752e63e0a403866dd SHA-256: cdb642b933cf4fa385cd897711d2b3f19226c94ba1c46798277b05a21a978375
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's purpose appears to be to lure users to external sites, likely for phishing or to download further malicious content, aligning with spearphishing attachment tactics.

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
  • 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://crophysi.ru/strik?utm_term=i+don%2527t+care+i+love+it+lyrics+clean In PDF document text
    • https://lobubanir.weebly.com/uploads/1/3/2/8/132814664/46ad1b82.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/goal_setting_worksheet_for_students.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/80221985479.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/fiseburibadaxiwu.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/pipizobowelub-bamasofofovod-deporejuj.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/50_shades_of_gray_trailer_2017.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/luxinobovelanevekemaxogi.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/96592715296.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/81368883398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_60209e0f923b7.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/finiwuviwupar.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/bufipevuril/standard_unqualified_audit_report_example.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/the_great_hunt_audiobook.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/are_schwinn_spin_bikes_good.pdfIn PDF document text
    • http://roveramo.atwebpages.com/bawajufut.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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 5064 bytes
SHA-256: bf4f49eda6df61b3bf3c57621ca65a06b39d6fe0c20dec5b7fb8db8d4c08c642
font_01_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 9992 bytes
SHA-256: f77927f708c07aacb834978314634c5c55e3ac38ce8427c8bfb85298111ab825

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