Malicious PDF — malware analysis report

Static analysis result for SHA-256 478bafbd71f5bd3d…

MALICIOUS

PDF

75.2 KB Created: 2021-02-13 09:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f3532d77c7c2396bfebc6f8d4826ac4 SHA-1: b191caddbea55a5e4b0f4ed155ba30a4ddffc857 SHA-256: 478bafbd71f5bd3d625927e07bae0b79777ab4466347df1da5d8e49c846a9f2c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

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://leonvi.ru/wix?keyword=zombie+catchers+mod+apk+download+techylist PDF link annotation
    • https://cdn.sqhk.co/tixunudixa/dOFHrhg/project_management_software_free_microsoft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd81a98dcb2f.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/class_7th_comparing_quantities_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_60043f48dd92f.pdfIn PDF document text
    • https://kibepujuvug.weebly.com/uploads/1/3/4/6/134644113/7752814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5ffdd2951f3c1.pdfIn PDF document text
    • http://noxesim.iblogger.org/tufisovudabojuneraxuzof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5fdd2adf02b5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_60068a3c5170e.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
    • http://ferurexage.epizy.com/cerasmart_gc.pdfIn PDF document text
    • http://zexenodu.rf.gd/apache_maven_3._3._9.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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 5456 bytes
SHA-256: 5ae110fc23ffaa7cb8bdb56bdf056204b18832bcf2f75052ff1cd1b65d519429
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 9824 bytes
SHA-256: 927d28b5eb00f092b93048c6b47204b77ea64aec0c236c5efe6702fc56b7f544
font_02_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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