Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0ad604d075f853…

MALICIOUS

PDF

89.6 KB Created: 2021-02-11 05:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fec9fe95b81198a56050d585a3264b31 SHA-1: 554240aaf392add4155ac2f0ff38e4107dece0cf SHA-256: cd0ad604d075f853c18a6901f3bf081a2189ddd85a305a8d006802e04f2b7ab9
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it's a phishing or trojan distribution attempt. It contains numerous links to external websites, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, references 'First aid merit badge worksheet', likely a lure to entice users to click on the embedded 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
  • 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://seumenha.ru/wb?keyword=first%20aid%20merit%20badge%20worksheet PDF link annotation
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/7441715.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/j5heUoz/six_guns_gang_showdown_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/jfjjiiK/hop_swap_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fd1aa8c35179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407793/normal_5fe03a47c60da.pdfIn PDF document text
    • http://kivedunorujuw.66ghz.com/62382415490.pdfIn PDF document text
    • http://towumodoxilokox.22web.org/temif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_601fe55a787d1.pdfIn PDF document text
    • https://karoxenerom.weebly.com/uploads/1/3/0/7/130739074/wuremuvudokolufi.pdfIn PDF document text
    • http://movigakamemik.22web.org/aylesbury_grammar_school_sixth_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fc6d69c1ef63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60248710ecdbd.pdfIn PDF document text
    • http://gugaroro.iblogger.org/nogogezefulenajopunopawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fda736fce722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runoxujozu.rf.gd/58288899208.pdfIn PDF document text
    • http://mesesoriran.epizy.com/kilovatitab.pdfIn PDF document text
    • http://pasazaxara.rf.gd/42915609759.pdfIn PDF document text
    • http://januxak.rf.gd/audacity_mac_book_pro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 5460 bytes
SHA-256: dfb4b0d35d243d2aced0213a80411a0971d36e1063f56f451a35c5b4ba787239
font_01_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 10556 bytes
SHA-256: de51ec38c63d34d495560573e99df096a3859e254aaa1f4bf88573c35f72a538

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