Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba151e7a2e90503…

MALICIOUS

PDF

66.4 KB Created: 2021-03-31 12:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd1ea58feba165bb3fb94b29a867ec8c SHA-1: 46d9de7b32fb80151b87f1a0f879a27abb18918e SHA-256: 0ba151e7a2e905036b6666f51d21c2dcff597058aa8fbb791aaf7ccfb99c9032
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'dafemum.ru', which is likely a malicious domain used for distributing further payloads or phishing. The PDF's structure and embedded URLs suggest it functions as a link farm, a common tactic for malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/award?keyword=ca+books+pakistan+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fca5e9887df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_6024b947434df.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/skyrim_dragon_language_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_60281a7d6d39a.pdfIn PDF document text
    • https://damupese.weebly.com/uploads/1/3/4/4/134492451/8141021.pdfIn PDF document text
    • https://dexigator.weebly.com/uploads/1/3/6/0/136049715/3252879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_604d1af75dbec.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/86884344733.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/upsc_mains_answer_sheet.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/8985570.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/f6c38224-4634-4caf-9440-f520952dac38/8020550106.pdfIn PDF document text
    • http://julepudelixi.rf.gd/panduan_belajar_bahasa_inggris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed7a915-7995-40ab-b71c-af19d4e53313/pudiludage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589bc7dc-3839-4175-a791-8d35c655202b/baixar_livro_parbolas_de_jesus.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/11440728894.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/78590091868.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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 5016 bytes
SHA-256: 2ec92397375b3a4e4a275a83c5a6068effb7be8360ace8f83ef51089bac576ce
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10552 bytes
SHA-256: 6a4f85d9a3939525f6422abda6966c96f5a3df3bda3dbf2bcb5aff89eba499d6

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