Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d8092c3b5073fa…

MALICIOUS

PDF

67.1 KB Created: 2021-02-21 07:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9faf17eac9904b3751c8b9dc6c9465c5 SHA-1: 4925304782d9fcce6d0eebcff5a731a3d691eea0 SHA-256: f4d8092c3b5073fa9d33ac3f6eeb32915763022bf78b815f4eace8c4572a070e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' suggests the PDF's primary function is to redirect users to harmful content.

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/wix?keyword=negative+binomial+problems+worksheet+pdf In PDF document text
    • https://cdn.sqhk.co/pazaxefuma/dhihiia/57992280905.pdfIn PDF document text
    • http://natnat.fun/mexidexariwuzuroramodezuv4bk9y.pdfIn PDF document text
    • http://shtangye.xyz/acs800_isu_firmware_manual7bgvc.pdfIn PDF document text
    • http://operationhomeplate.com/wazizawikhuua2.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/hhhJoVI/9626877458.pdfIn PDF document text
    • http://byt-upak.ru/assassin_s_creed_revelations_androidikvdn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5fd043cf123ca.pdfIn PDF document text
    • http://bbflowers.net/65214770544vyu2f.pdfIn PDF document text
    • http://redtea.space/kazowuxoparakinuvuvu3g8jc.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/zHgijg9/1047032059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5fcc9b5571c20.pdfIn PDF document text
    • http://uablog.site/29770726187hbp9u.pdfIn PDF document text
    • http://naturebiolog.fun/xeloxaletakabetibarijubo9m8lt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5fe6cad0ed651.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/iihdibv/30368460529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veveliwuw.rf.gd/chrome_installer_free_for_pc.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_off0000c801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 5780 bytes
SHA-256: b46c3dbd691a568d79d435e4e74d3495ed012da456106b89a6f394b342429a92
font_01_sfnt_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 10480 bytes
SHA-256: cbf9c5d9fbf61e71a287a098392641b5062ad6d4335bbdcad533f5e7ab3badfc

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