Malicious PDF — malware analysis report

Static analysis result for SHA-256 845df90cc69c3c86…

MALICIOUS

PDF

61.0 KB Created: 2021-02-18 14:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 0b353f84b3a448598c5c62de3bdd3928 SHA-1: b3aab07f049b672a12e6b4110675702ee18c5fa7 SHA-256: 845df90cc69c3c8659a55b5f4421ad0d746a8a7f4b77308df16561ae18f38595
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://yafferge.ru/aws?utm_term=technics+sl-d2+cartridge+replacement In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5fdc08a772857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389576/normal_5fee10cddc7a4.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/5874713.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/mewodotaxarerakaze.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/pufezunajebavadaxuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5fec70259e279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5ffc65b26ceb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6b15080c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5ff5892896cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_5fd9e084a53b3.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/fodose/mailchimp_email_template_gmail.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/27248594141.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/korov.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/c_form_verification_punjab.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/xurudimiduwegipepot.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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 5600 bytes
SHA-256: b38295ffb074e86357901b61cbd97c3abbd38a80443d9adc26e3247b5adda044
font_01_sfnt_off0000c4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EF 9996 bytes
SHA-256: 50d9a842f5a61d44add0f04861b79592cb780cedc45318e4ac3a0df1a9cf01f8