Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fb9ec6d9feae2a…

MALICIOUS

PDF

68.7 KB Created: 2021-02-15 11:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a95e1f6e3e651f2e5cd5f85326a6f7eb SHA-1: 228ee1544cfd7c156135a26808806aa366cf7b01 SHA-256: c7fb9ec6d9feae2a3dacb913f41daee4ba96b4725634ce08820de49b3416976d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though obfuscated, suggests a lure related to a 'weather report', which is a common tactic for phishing or malware distribution. The presence of multiple external URIs points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=castellon+weather+report PDF link annotation
    • http://agentsoft.space/ludo_king_app_download_karenh1zkk.pdfIn PDF document text
    • http://1gusevshop.space/ginifivusumasomn7u4.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/cjcdIjj/71668700841.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/grvhfyH/4_pics_1_word_level_2248_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/Nhdyggv/13152082673.pdfIn PDF document text
    • http://stalekost.site/punekalamivinof4xx9c.pdfIn PDF document text
    • http://show-visitor.xyz/wegubasep8h83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5fdfd72cdf697.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/jbjcwru/cut_you_off_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/ieYiivn/74766451571.pdfIn PDF document text
    • http://savadaqwe.space/satewulug9spm.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/xuzakob/rojabowunematiwe.pdfIn PDF document text
    • http://wisunomimat.epizy.com/pudubipom.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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 4904 bytes
SHA-256: e83c014b4499785adecdf194d7140e21772e79ce2cea2c71b7abfd40bdc346fb
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 10584 bytes
SHA-256: 608a9cd476dcc5329ee414308da0e286e0346699fe4d6eb55d01fba94c782701

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