Malicious PDF — malware analysis report

Static analysis result for SHA-256 0901ae0de0401155…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 15:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ebbfb033f8acf9aa7b1b32a95d44c200 SHA-1: b49ae2c7ad3abd7988bcaaa94647839824ab7ed2 SHA-256: 0901ae0de0401155bcf4ba4ba4f1088216b2ab3b328e17eecdbfd053e70f7a64
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, but the presence of links and the heuristic firings point to an attack pattern involving redirection to malicious sites.

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://dafemum.ru/strik?utm_term=o+que+cai+em+historia+enem In PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5fe5d0bdd0f3b.pdfIn PDF document text
    • http://moneymaya.site/annihilation_book_ending_explaineds2new.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5feb797c14966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_604120c277de7.pdfIn PDF document text
    • http://repair-foto.ru/how_to_remove_certificate_authority_androidl99x0.pdfIn PDF document text
    • http://teplotronic.ru/fekurokexrzv1g.pdfIn PDF document text
    • http://instapodarok365.site/singer_sewing_machine_manual_model_158mvwx.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/wuniku/what_is_the_novel_alice_in_wonderland_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6ac76e-fb62-459a-937a-aef420e54f41/87424473629.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/asus_z77_pro_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/guvararu.pdfIn PDF document text
    • http://pogebikaku.epizy.com/68590446911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e6655d-5c35-4833-8e1e-5d8eaaaed4fb/how_do_you_start_a_transition_paragraph.pdfIn PDF document text
    • http://genavologu.rf.gd/non_pharmacological_treatment_of_depression.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_eb80ae6c5fac4c40aed95f629317235b.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_640e2973b9f544678b25c4b4633482ff.pdf?index=trueIn 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_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 5160 bytes
SHA-256: 31f59c9ad4f5faa1e0b6a1ffc368234baae78c7345ee9f5441bbd85d571cb44f
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 13004 bytes
SHA-256: bcb68ffb5240bff55008206a43904e636674a10c42e4c9891b831c9ebe0909aa

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