Malicious PDF — malware analysis report

Static analysis result for SHA-256 0899042ab087891e…

MALICIOUS

PDF

72.3 KB Created: 2021-02-10 15:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 86938ed7902c59efbff97576be48557e SHA-1: 5be707999f53d9841fcc7a6b677910a5cc226371 SHA-256: 0899042ab087891e8289d01c8712cc9bf1c9c7f7b83cb31c0f66bade9a592114
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=nc%20cosmetology%20written%20exam%20study%20guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5ffacbfd787be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5ff9c10cf07ae.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/xopagiruzixeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5ff77203eac5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_600dd0b6a7962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5fc56fbae7b9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff0be5dc0d32.pdfIn PDF document text
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/nuvukupofuxew.pdfIn PDF document text
    • https://desijikero.weebly.com/uploads/1/3/5/9/135964668/8852001.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/fagasepabanef.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/magarakupekidup_sanesajarubave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fda87dd9f334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6006fa37821c6.pdfIn PDF document text
    • https://cdn.sqhk.co/lafugafeniki/jcTrfib/word_forest_free_word_games_puzzle.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/rugetediz.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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 5488 bytes
SHA-256: 7c9929cf0b81fe8ec201d78b33192be69ace7c6e878624320d9fead7e02407e8
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 11184 bytes
SHA-256: 0755aedb8a601b180ffc8939cc888c75e2e9becef726ccf4a0045dc23da1ec3d

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