Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5253a7406d4be7d…

MALICIOUS

PDF

66.9 KB Created: 2021-02-24 11:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dc889c74390b8eb6d0252bb15d71bc44 SHA-1: 30c0e12aaa90fd7d6f14c80afddb053a3c7419f7 SHA-256: d5253a7406d4be7db14adce31f2470221acc37689c5d9397a1e3b58c3c05e83d
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Sherlock Holmes books box set', combined with urgency language. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/wb?keyword=sherlock%20holmes%20books%20box%20set In PDF document text
    • http://najezeb.22web.org/tusogisidelefusa.pdfIn PDF document text
    • http://lutekorudafu.iblogger.org/46947143616.pdfIn PDF document text
    • http://liginirudusupob.22web.org/hero_airless_paint_sprayer_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5ff58b51747c6.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/dubiditiginowo/jifoximibuxejaz.pdfIn PDF document text
    • http://jojixeme.rf.gd/58156520981.pdfIn PDF document text
    • http://batunat.epizy.com/mfj-989c_versa_tuner_v.pdfIn PDF document text
    • http://jalugegaru.epizy.com/fashion_report_ffxiv_guide.pdfIn PDF document text
    • http://pewusufep.epizy.com/28624077246.pdfIn PDF document text
    • http://saluniwolu.epizy.com/united_nations_vienna_guided_tour.pdfIn PDF document text
    • http://lawupoxag.epizy.com/akulaku_apk_2._3_3.pdfIn PDF document text
    • http://nemebikox.epizy.com/invoice_sample_in_excel_sheet.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_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 5204 bytes
SHA-256: 00578b3441ffff37f2da25cf8e06a1d08619d9d295e34cb07283b05adf2a9463
font_01_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 11096 bytes
SHA-256: 29fc10bf6b5a3140dc304ce6c2b62410dffee6370fc363a32bbfad237ce208cd

Open this report in the interactive analyzer, or submit your own file for analysis.