Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf05c31664d7dac2…

MALICIOUS

PDF

72.5 KB Created: 2021-02-21 23:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f10fca3015da899db91e7a103becf504 SHA-1: ddc1a94afe6f3176e79bcc3ecc3f3f816eaca630 SHA-256: cf05c31664d7dac2ea2844bfc5b34c29980fbe7267a2be7efcaa485b8db11e8b
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/wix?keyword=old+town+guide+119+review PDF link annotation
    • https://pisaxegeb.weebly.com/uploads/1/3/0/7/130775455/df31c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6013bf6da2e24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389101/normal_5fecc5559b06b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401994/normal_5fd04d07c084c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_6016da6a7f6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_601fab3a80df7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443354/normal_5feea44e67e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5fd8598642702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_602e9fbd09dcd.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/jb5OMic/55071596204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_60192f163a84f.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/tesodagiwor/lekobisunozuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/21858393810.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/tid_asha_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/73669399268.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/spongebob_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/zenilor.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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 4992 bytes
SHA-256: c05a2406ad950dc4a81b15a37b3289ca0e882ec2e3d5d8b5a23ff53868e71247
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10456 bytes
SHA-256: 6a503848a37a2174ed03465e4277c8ca8a856d4deea17b4c0a196d8633cce311