Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb8a45960f5253…

MALICIOUS

PDF

74.5 KB Created: 2021-02-02 23:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1d5f5610c0a2af0424f98dbef7409eb0 SHA-1: 54702f39634807c41343df08dcd39dd292f9400d SHA-256: cdeb8a45960f52535bc6f2f55f168a73fb0e43165ff2f460072ea1bc07d98d30
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains a significant number of embedded URLs, many of which are linked to known malicious redirectors or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the extensive URL presence suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=transmission+lines+basic+theory+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_5fd184da7e80a.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/sugomovuvuj-bogupip-dukididopedotal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_5fe7d334c9fe8.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/3992340.pdfIn PDF document text
    • https://puziwurawube.weebly.com/uploads/1/3/1/8/131871408/3913054.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/8df4ee0c0.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/vonevuxejinub.pdfIn PDF document text
    • https://ximepovefuvaxoj.weebly.com/uploads/1/3/1/8/131856443/lijujerixelem-fisavujesedoxig.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/wupuxus/android_10_oppo.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/neril.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/hello_neighbor_hide_and_seek_android.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/apologia_advanced_biology_module_10_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/landing_page_template_spa.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/pyriform_sinus_anatomy_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/58585617204.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/85372773002.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/potexevadet.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/gas_chromatography_software_free.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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 5588 bytes
SHA-256: 6d0293e8ca02899749605deba824d40acd10753143cdaba08aaeb77f3a56744d
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 10296 bytes
SHA-256: 3fa04354237b2c5f7291ac27a86f147b85886fff92d60105fc756b92d9579df8

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