Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a75dc9389ece128…

MALICIOUS

PDF

76.3 KB Created: 2021-02-20 13:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b349f7836d94123d43a541004fe49e54 SHA-1: 6176eee177c14275b68c61ab24d9b15e87bc3d41 SHA-256: 2a75dc9389ece1286ff7cd21a80777009251f308fd1823cd9ba79c276cc08c51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to suspicious domains, suggesting it's part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to a 'user manual' and 'wkhtmltopdf', likely a lure to disguise the malicious nature of the links.

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://jottigo.ru/123?utm_term=kidde+kn-cosm-ib+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6025ee232551b.pdfIn PDF document text
    • http://geekcods.com/mizoramamomutebekn7r03.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/zerefewojalidog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5fddc60045963.pdfIn PDF document text
    • http://jitokinut.iblogger.org/52037001179.pdfIn PDF document text
    • http://werenntaq.online/situational_english_booktfb01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fc7b39c2b879.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/eahbhjg/the_great_courses_plus_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/iIHzwfw/13610906911.pdfIn PDF document text
    • http://cccckkkkkdd.space/materi_akuntansi_biayauzldg.pdfIn PDF document text
    • http://myyshooop227.site/289391080661gytn.pdfIn PDF document text
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/vuniluxojidojegu.pdfIn PDF document text
    • http://crispyset.online/mods_de_autos_para_rfactordo6b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446273/normal_5fe3476e8dd50.pdfIn PDF document text
    • http://vagijuderotogur.22web.org/ashampoo_photo_recovery.pdfIn PDF document text
    • http://astrohelp.space/betitowimobozgkt73.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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 5292 bytes
SHA-256: 14b1c26f556d93e9f76d7c5880533669c74a17bd8fdf7f8f6860435ee0c7a1e3
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 10996 bytes
SHA-256: 53909dd2f702220575b63bc422e531408580c0e700f5b3e58a678014b3d6157a

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