Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3951cf4aa3d5c77…

MALICIOUS

PDF

70.3 KB Created: 2021-02-15 09:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ab11fbdb11c9ca29575745b0ae68b693 SHA-1: 421ea5202b17ed1ea0f85b0547866121d365208f SHA-256: b3951cf4aa3d5c77a5b9a3c7c84176d2fbb5589c1e05e0d24cb2e425eec8a7b8
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://baarspo.ru/wix?keyword=cool+math+unblocked+games+77 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493579/normal_60285b12a7faa.pdfIn PDF document text
    • http://chemistryplus.space/jumpstart_kindergarten_1998_bgmnnrq5.pdfIn PDF document text
    • http://form-copyrightservices.com/sofa_cad_blocksbno6h.pdfIn PDF document text
    • http://bilkaita.space/tivatidizicl2tg.pdfIn PDF document text
    • http://meetchambre.xyz/muvazebagifakwt9ee.pdfIn PDF document text
    • http://sandwichhq.club/483345551527xwiy.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/pofinevukij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_6008f80ab7cf2.pdfIn PDF document text
    • http://kanshoper.site/koromigixokevovwkq6k.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/7822570.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/mukutud/calculus_volume_1_tom_m._apostol.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/keynote_templates_free_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/list_of_airports_in_india_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/vpn_365_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/upsc_ka_full_form_kya_hai.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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 5448 bytes
SHA-256: 7f317a3202b7b36c920e53940fa623315bc65b62d4da46eb91dde907bfa33ccb
font_01_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 10636 bytes
SHA-256: cf6e8c744c3b827692c930f97f4a1e0056f5f26b26c199cc2b7e25801863f41d