Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f1db7bb1d50513…

MALICIOUS

PDF

77.3 KB Created: 2021-02-25 05:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1eec7b33847aaeafb201db63106e7373 SHA-1: 48ab15568a22f30fdce335750463139214d3ec02 SHA-256: e4f1db7bb1d50513a0477225dfd663d8b3e94e2d06f13a931d7fce76acb02b36
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. The document body, though heavily obfuscated, contains text related to hair dye removal, likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=how+to+get+splat+hair+dye+off+your+hands In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe980fd3cf87.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/national_rice_cooker_manual_sr_mm10ns.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/14509096610.pdfIn PDF document text
    • http://ketorebagibof.22web.org/assistant_manager_customer_relations_job_description.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/how_to_activate_gta_4_manually.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_6018ca74465ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5ff76b9fbaea0.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/32584382580.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/vudivuzakal/birthday_invitation_design_templates_free.pdfIn PDF document text
    • http://bizumel.epizy.com/87409785611.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/lagu_ost_missing_you_korean_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/27446762587.pdfIn PDF document text
    • http://pavemadimakok.epizy.com/voxedenepidosavuseze.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/ramdev_yoga_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/vce_to_online_conversion_tool.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5456 bytes
SHA-256: 7d571ee2f3ac9453bedfedbfa47d618c8480f71396ac807b3dd24b193555a72c
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10728 bytes
SHA-256: 8bd440d415ff637f4266d9a978fd12e19022fe6569e0833e99fa2c40b47fb17d

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