Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb765c3691b1b198…

MALICIOUS

PDF

78.7 KB Created: 2021-03-01 04:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 62220fd456172dfdc25a1ddfc6f913cc SHA-1: 725e086b92f217f41dab7fe84dd1aaaa0429954b SHA-256: cb765c3691b1b198eb848b9e60362388023c55391f251c2dade1c4ec06ac4ef9
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule indicating an image lure linking to an SEO redirector for free-download phishing. The embedded URL and the primary URL found in the heuristics both point to the same suspicious domain, 'midufefew.ru'. This domain is likely used to host malicious content or redirect users to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://midufefew.ru/strik?utm_term=how+to+insert+a+page+break+in+wordpress PDF link annotation
    • https://cdn.sqhk.co/dijabidasu/ijhdigV/wirakirafa.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/79741921118.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/ghiahag/86852533034.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/3wPVxjd/42161160966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_5fda937502629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_5fe9acff973a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000f1b4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000f1b4.bin)
    • https://s3.amazonaws.com/vavapekadoliti/tamilrockers_0._2_tamil_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/convert_base64_string_to_angularjs.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/62487212242.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/jubuzixusoxob.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/money_loan_agreement_template_philippines.pdfIn PDF document text
    • http://duvodix.myartsonline.com/divuwanobak.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/internet_traffic_monitor_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/capral_aluminium_extrusion_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/zobaw.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/13605235230.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 extracted file (font_00_sfnt_off0000f1b4.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 5352 bytes
SHA-256: d8d0866f6c282678821a31bcd3781f0c412d480a76a803555ea0986145cd9382
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 12328 bytes
SHA-256: 847695f9d0f0fe46bd709c5366ac4d7a8680e6c37749b88783e605980961957b