Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bf9aee2640f2f2…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 21:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 91c71368b8adc53d561a68875edae17f SHA-1: 938a54cd20fc98e4e53cd1d88e6f22d814dbff68 SHA-256: 23bf9aee2640f2f20225bd2980f118e3c575340269e41ab8380b09bb7ee80952
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/wb?keyword=the%20road%20not%20taken%20tone%20and%20mood In PDF document text
    • http://tehnotop.site/what_are_the_four_basic_operations_used_in_mathematics7bzjy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_600a22c2433bd.pdfIn PDF document text
    • http://jakor.pro/motorola_mc5590_drivervj7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_601ecb8ee0b5d.pdfIn PDF document text
    • http://0fruits.space/981602880603x5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_5fd2fdb8baf28.pdfIn PDF document text
    • http://potenciy.xyz/why_was_government_of_india_act_1935_introduced0n2j6.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/hiahghh/fakogivipapamudivut.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/TjgSBie/54898332320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5ff5f1c31e8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5ff8903525e45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fca7ef64f39d.pdfIn PDF document text
    • https://cdn.sqhk.co/tidaxetosi/uhhelCw/nearby_friends_not_updating.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_5fc68fbd794e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_600494d8cb957.pdfIn PDF document text
    • http://good-production20.site/39028789753diggm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_5fec1639c5502.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/bipovoromoj/16936110045.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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 4868 bytes
SHA-256: de01ea450fa148e637de3394670c2cdbae88bb56fccb42ced1ded779886ca5fd
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 10388 bytes
SHA-256: 1e81359f4b6f0a876a70ee652308fb2803e976b6388d7d2a3b8e66859785eec7