Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4661d71cc201c61…

MALICIOUS

PDF

69.5 KB Created: 2021-02-27 17:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: b9cb181669de03a3ba78c36e58313cbf SHA-1: 10fd25d354373977c5fd2335a394b9df16ff7354 SHA-256: c4661d71cc201c61a7b358d24111d916ab41e17edf0a1c00b425ff5ed4e0618a
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://seumenha.ru/wix?keyword=trade+ups+csgo+2020 PDF link annotation
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/3827171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5ff462b38e12e.pdfIn PDF document text
    • http://revershjtb.site/patrick_lencioni_five_dysfunctions_of_a_teamufs77.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/ehiYJgj/transfer_news_now_deal_done.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/Shclje4/marketing_strategy_examples_for_hotels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5fef0ff887d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5fdc2a13001ab.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/numuz-letobaka-kilaz-kurazopilomo.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/b9e47981.pdfIn PDF document text
    • https://borojixupoluba.weebly.com/uploads/1/3/5/3/135316148/ac0d6eb6f655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fe5016a0d85c.pdfIn PDF document text
    • https://fifurinirolegif.weebly.com/uploads/1/3/5/3/135306558/pamezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_600d2adb763d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5fe3e19b8ad4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozadugaweguj.epizy.com/application_form_for_loan_sample.pdfIn PDF document text
    • http://joxumokuri.epizy.com/33015628728.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_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 5432 bytes
SHA-256: cff611d7e560ad4c7fbf8ba311199d18ea08c04a6b9f823c6e12138d0b46a861
font_01_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 10380 bytes
SHA-256: 3f2c45270fda7099c8919c5311f8bbe3b4829414d420a175f80727ad4bcbe8f2