Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e841073339616…

MALICIOUS

PDF

73.9 KB Created: 2021-01-14 00:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1798a645565c17648b01cc7489ee8f6b SHA-1: 2c3ac2552d1ecadb45aa26f7bccdd5123c7ae395 SHA-256: f84e841073339616ef91b19b54cb22f0cdbd8fc6eea2ada11832cb9a0dd5d845
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host and redirect to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=hustle+dance+steps In PDF document text
    • https://site-1168389.mozfiles.com/files/1168389/piwurevifekoresit.pdfIn PDF document text
    • https://site-1174360.mozfiles.com/files/1174360/whatsapp_wallpaper_library_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ff7576b2898a.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/rugeguvatum.pdfIn PDF document text
    • https://site-1228403.mozfiles.com/files/1228403/free_capitalization_worksheets_for_1st_grade.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/xowunugalerepimoz.pdfIn PDF document text
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/2742622.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/zogiliga_bibekofafituzo_muxudowi_bewojufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd1596ed4b1c.pdfIn PDF document text
    • https://site-1173205.mozfiles.com/files/1173205/58959894830.pdfIn PDF document text
    • https://site-1168164.mozfiles.com/files/1168164/xubuwamisobizavusozutodel.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 4932 bytes
SHA-256: 075ef2f2d7e640f38be9ce0465dac9bae6839a33cd3a641a1a954b62828816f1
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 10940 bytes
SHA-256: 7421440fbebfd1abbc2b74696c330baeac02483c6d517ddf78ebdd41cb98772f

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