Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1f881dcac32a74…

MALICIOUS

PDF

68.8 KB Created: 2020-12-25 14:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9d8917df454dbb66e375025f15e8a9cc SHA-1: b14239a97a7d1752cc40ed573a3a950eccde04a3 SHA-256: 4a1f881dcac32a74845ceed4d3d6c6dfa6170359e24d82ab7ab93a35cfe40765
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains multiple embedded links, including one pointing to a known malicious redirector infrastructure. Heuristics indicate this is a brand-impersonation credential phishing lure, specifically impersonating eBay and promising free Fortnite accounts. The document body, though heavily obfuscated, contains keywords related to the lure. The presence of numerous links on disposable hosting further supports a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/ruwoj.pdf.
  • 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://cctraff.ru/123?utm_term=fortnite+accounts+for+free+ebay In PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/ruwoj.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/tudimemejat_gafipejorifobek_sofidakokigana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fe4ff052c51d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fd3cd0153a26.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/gebar_wuvapolo_lopeboxatadopov_kumukukilonivid.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/topozamo_sikuzirip_zefojeju_lerawanodus.pdfIn PDF document text
    • https://waxatuvew.weebly.com/uploads/1/3/4/3/134371429/2d935c2e161c6a.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/jihiLtX/59436392362.pdfIn PDF document text
    • https://sivamodinuna.weebly.com/uploads/1/3/4/7/134762665/001188259da.pdfIn PDF document text
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/bajok.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/5d6e0fe9-03e6-432c-9dae-ca00a92978a8/pre_cooked_chicken_wings_in_air_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9c27eb-d6b1-4a82-985b-f6670d1f95a3/cech_2501a_jailbreak_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9ca1a6-beb9-4f9e-82c4-bc9ea356a0be/ketewareza.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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 5040 bytes
SHA-256: 3716d7cbcb2b24f7cc3258656a74ce623729cbef49473ccfe30c1958694f66c9
font_01_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 10092 bytes
SHA-256: c810d75659f22ca861f4da8a3455314ae4c26259437a534165db126e2b16fde8

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