Malicious PDF — malware analysis report

Static analysis result for SHA-256 185ef3d75f452d2f…

MALICIOUS

PDF

67.6 KB Created: 2021-02-13 04:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 08c479971d5f3a0a23c4d52689764515 SHA-1: fe27b40ac3ab65f437db7f90ae3d1b3307d691b9 SHA-256: 185ef3d75f452d2f756e4f3408c9058247089fc13f5dfe204f7c1c16144073de
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=periodic+trends+practice+worksheet+answers+chemistry PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501206/normal_5ffb5d54a7b7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_6003b66c96da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fd9161ee37e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_6024b55964851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5fcceb3f1bd27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_601eb98f7c3c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5fce6bd64000b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5fe85629acea1.pdfIn PDF document text
    • http://itdiscounts.pro/maplestory_m_guide_wiki9kff1.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/AZhjJhd/taz_wig_closet_girl_mono.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ijgdjfg/92126945629.pdfIn PDF document text
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/gibomo.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Chd9Zgi/runner_tom_hero_jump.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_600533f68c875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422638/normal_5fd067c0ecfdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5540 bytes
SHA-256: 2653717fe14508efb71bc695570ea2b85736de4c565141b19cbd83b96ba12176
font_01_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10368 bytes
SHA-256: 1c5468d9709b192262f7368bf381448f277000de4b5296763d32efb5865af115