Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db94ecd9e231f03…

MALICIOUS

PDF

69.3 KB Created: 2021-01-11 10:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3bf52da093ce77f29cd929b0128e4a19 SHA-1: db28c2bb9000a6f606a0da06168496bb9eac5fce SHA-256: 2db94ecd9e231f035bb6ed3ba1b9b388c91b5634073a61c176368ad5e79b1c25
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=clash+royale+apk+2016 In PDF document text
    • https://jowufawogutezob.weebly.com/uploads/1/3/0/9/130969037/5603645.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/best_movie_collection_organizer.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/fhfgecd/menavesufanusaduzexa.pdfIn PDF document text
    • https://site-1179698.mozfiles.com/files/1179698/53517942534.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/bPhiees/uber_eats_order_without_app.pdfIn PDF document text
    • https://site-1175696.mozfiles.com/files/1175696/cookie_clicker_wikia_achievements.pdfIn PDF document text
    • https://site-1175933.mozfiles.com/files/1175933/tubers_life_simulator_mod_apk.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/wufizazob.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/74906853770.pdfIn PDF document text
    • https://site-1182802.mozfiles.com/files/1182802/65894838860.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/zatubuvokubizu.pdfIn PDF document text
    • https://site-1168337.mozfiles.com/files/1168337/fukevisonuzafegukapu.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/CAyhhhe/kuwepapakifofidivogotev.pdfIn PDF document text
    • https://xukabasal.weebly.com/uploads/1/3/0/7/130776322/0226fccd341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 5456 bytes
SHA-256: 10ec19da178173195904c6d586710bd37aa33d183946135e2bd2c6b0cb79ba78
font_01_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 10932 bytes
SHA-256: b7f76ebe43e53787bbb8050f48e66edbda244c79e786edcb9264d2add74d434a

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