Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff8a6f65d5c8320…

MALICIOUS

PDF

79.5 KB Created: 2021-02-17 02:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8b3ecfe5aa0f675860648a43d0d0256b SHA-1: 424dd252463ca7fa54ed6bfe6478018b7d8de5e9 SHA-256: dff8a6f65d5c83206316f3d875ce08879bee48f96850f5ecd45fb99e9412c572
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a URL that appears to be a phishing lure related to logo creation costs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous PDF files, suggesting a malicious intent to distribute phishing or scam content. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+much+do+you+charge+for+creating+a+logo PDF link annotation
    • http://trokot-roznica.xyz/zeds_dead_merch_sale3gaq8.pdfIn PDF document text
    • http://latuha.com/skyrim_books_beggar_thief_warrior_kingzjf3w.pdfIn PDF document text
    • http://mattelipsticks.site/sowalowebepudabozidepthez1.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/brookstone_aperto_wine_opener_manualzigxn.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/leleratoze.pdfIn PDF document text
    • http://uggi-ugg.com/cartoon_hd_android_boxg8adx.pdfIn PDF document text
    • http://spainwow.pro/95804972830mr47t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xapidajovaji/96668554761.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/zimuxafagidog.pdfIn PDF document text
    • http://kosejoviwo.epizy.com/lelarozanatoxaduboxu.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/xegorabekuzeda.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/lusulepa.pdfIn PDF document text
    • http://bejewidokani.rf.gd/52178783992.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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 5296 bytes
SHA-256: 8c7817529a1061b883cd95f25917d6263b9cc735915e77d33d49f6291e123516
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10644 bytes
SHA-256: e391c25e0781cb756129cd36d8c2a7c3e878c4acf61630e2be1124507ba0c492
font_02_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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