Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fa283e9a6d4638…

MALICIOUS

PDF

70.6 KB Created: 2021-02-19 15:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 77a14eafa5700458fad1409605c888af SHA-1: 7de4e3dc3a60d9167403397f5f73be79b23e3f7b SHA-256: f8fa283e9a6d4638bad638be698cdf1b15bde7f86e0470cff56f66ffb55520f3
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to changing an algorithm on a charger, which is likely a lure to disguise the malicious intent of redirecting the user to the provided URL.

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
  • 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://yafferge.ru/123?utm_term=how+to+change+algorithm+on+delta-q+charger In PDF document text
    • http://fosufupivufup.66ghz.com/taramonimubekuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_6027d7dd35877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5ff169ccd600f.pdfIn PDF document text
    • http://4gusevshop.space/49229262049vtd4u.pdfIn PDF document text
    • http://losmopaka.site/ruzokorenatafuwuravaxuwiclrwi.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/resixexi/valgus_deformity_foot_dog.pdfIn PDF document text
    • http://ragasusivoreta.epizy.com/38629483206.pdfIn PDF document text
    • http://jonegukum.epizy.com/reactions_of_aldehyde_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/vivagixonawug.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/abound_abbott.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/77145503431.pdfIn PDF document text
    • http://jopivot.rf.gd/chutti_tv_dora_vin_payanam_tamil.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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 5384 bytes
SHA-256: d40b4b65eb12e5355011b7458bb9cd66f8723fade2565e7e717800670e3404b0
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10792 bytes
SHA-256: c24bf86300c094e3b8c7de551e215c37866c4efc166094a040a574f4494bcf81

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