Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f9dfc169df181…

MALICIOUS

PDF

72.6 KB Created: 2021-01-30 02:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 220eaf63e47468ffd894d8d0a9426816 SHA-1: 34728a78fefd7a037544c7dac7d13d29b95d76a4 SHA-256: c37f9dfc169df181a4e14416d1bf3ad32597dcc7fa5e87a8fda4e6e3b2a56ca8
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/wb?keyword=ludo%20king%20mod%20apk%202020%20download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fcebd6935576.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/MhdKge2/three_kingdoms_the_shifters_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_6013e120845c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fd885b0b140c.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/jeheBLC/pavakusekurafimifam.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/19167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5ff179331003e.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/jthchgc/factory_incident_band.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fe699fd57045.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/hgeCm4Q/san_manuel_slot_technician.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/ghc27gf/dorupemiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/IOhgigh/53662393993.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/nonipesikiri/antigeno_duffy.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/zezinib.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/18245017892.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5376 bytes
SHA-256: aa3685ad5e122dccbfbb7f2edb2974e8b1428af66d7a5d928f85c9ca5d159d67
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10628 bytes
SHA-256: e50a2eee6e4633fea00722fb0387f2b4bc44e023afbbbb03cdc1ba4d717af178

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