Malicious PDF — malware analysis report

Static analysis result for SHA-256 189b73e31ce5ec0f…

MALICIOUS

PDF

80.4 KB Created: 2020-12-02 00:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 035260b011fec84bfcfedd50af1635b2 SHA-1: d396836053f8e458e0a356c62748648b63f378d2 SHA-256: 189b73e31ce5ec0f435d747372fe5d12a4c12a18f432e5a70d56362bf26a1388
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest a phishing or link-farming scheme designed to direct users to potentially harmful websites. While no scripts were extracted, the presence of numerous external links and the ClamAV detection indicate malicious intent.

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 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://ggtraff.ru/strik?utm_term=jerry+rice+ncaa+records In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fa8b8fe0594b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fa1b7fc67454.pdfIn PDF document text
    • https://rizaxulizogi.weebly.com/uploads/1/3/4/7/134753796/bazolatoxibusas.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/budimajaren-damas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5f94a2edc970e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5fb78bcc61fa3.pdfIn PDF document text
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/doxugog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f917da4d5d40.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/538705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e957adf-5844-48c7-97cf-587b9c56eb16/fopojaximaxeboliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d97e7d-a842-4154-8145-425b78e5903b/84041768690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d2d28d-f94e-4df7-b732-7a08173e9b5b/fujatalulizebimatolujed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373f8157-be8d-40e8-b984-02ae8c0064a7/sebaxeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956d3741-e536-4b99-b8cd-ea65b2b1f794/27152911088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4548c26f-3155-4a7a-b740-1df22bae4b00/57386266085.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_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 4992 bytes
SHA-256: 71c900555f8b11a8f2295975f365266dc6ab4f6bf7363e589d829ebd4ed551ae
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 11208 bytes
SHA-256: ef2a1d1e73cb07d714d28d9994c43f7c535b6922b3a609308b0ba5df96adbe96

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