Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ff94d26d10833a…

MALICIOUS

PDF

66.4 KB Created: 2021-02-23 09:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9c7afd76e9ad607cd29f80862a61be16 SHA-1: 5e5418b9585206e2118663fc1e9ef5626bb58798 SHA-256: 21ff94d26d10833a8e42101f117ed86dffd0a11ed17d45ea08d6c50101689bb2
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://maypoin.ru/aws?utm_term=rue+ukulele+chords+girl+in+red PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fd9b88393c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_602981bc847b3.pdfIn PDF document text
    • https://zetoruribafepa.weebly.com/uploads/1/3/1/4/131452904/72fd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_5fdc39b1971c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fd2f367ce2f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcbfe899a250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fcaff1d82691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500678/normal_5fcae5d571190.pdfIn PDF document text
    • http://getcreditreport.info/junukenegafutow5bmkn.pdfIn PDF document text
    • http://noverst.xyz/remove_password_from_excel_2016_sheetqetgp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5fdca441593ee.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/lazesej/25650840305.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/wojutoduxavukunub.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/mystudentbody_drug_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/zeparogakuxufisopigefuded.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_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 5064 bytes
SHA-256: 6c85eacc725f919b2ce59f976ae83a14b5a54ae580b3a867ecc058759b149221
font_01_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 12036 bytes
SHA-256: c7e9b9f6e62c3277330c90f0933490d3bc260b270ba9f2bbd9aaa29acc491711