Malicious PDF — malware analysis report

Static analysis result for SHA-256 624df2181e70f817…

MALICIOUS

PDF

74.1 KB Created: 2021-02-16 13:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 610c91934fe91dba33a7a3dda02633ef SHA-1: a954659b31a2a32a49c15fc9ace14d20b666fbab SHA-256: 624df2181e70f81782d54bcb871140ce3a000cdc8187349f9afee79e5f159a86
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious URL, which is likely used to deliver a phishing page or a second-stage payload.

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://crophysi.ru/strik?utm_term=form+of+psa+marriage+certificate In PDF document text
    • http://itdomen.fun/lasarudazivakq3is.pdfIn PDF document text
    • http://top-odejda.com/zifotiloluwawiziloxby7k3.pdfIn PDF document text
    • http://dutov.org/halves_worksheet_grade_14pb36.pdfIn PDF document text
    • http://ejinaya.com/peanut_patch_boiled_peanuts_nutrition_informationtlz1q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_5fca9c707cb47.pdfIn PDF document text
    • http://mklhhhh.space/97938172251apc04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459466/normal_5fe5f03dc4393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_6029ecc7aa7cd.pdfIn PDF document text
    • http://onlineeshop24.xyz/star_wars_rogue_one_film_locationsi5tct.pdfIn PDF document text
    • http://mattelipsticks.site/11441550280bpy8c.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
    • https://s3.amazonaws.com/dazovosugev/bdo_failstack_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/picture_gallery_bootstrap_template.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/virozorivobi.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/2928421780.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 4940 bytes
SHA-256: bed92a3962c3b29f752609e01a860e86918fb3343c8957466e04f9a487acf26f
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10632 bytes
SHA-256: 850930b1887a135c85fcc8149e6886f8e41b764ad19d3c8348a5d69b3cb8100f
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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