Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81143fc8a48893…

MALICIOUS

PDF

42.7 KB Created: 2020-11-09 15:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 31131caf1e5087850e6f7f9bbe57176d SHA-1: 0f7af695068d709d52ed280705861914c47638d7 SHA-256: db81143fc8a488935767bba43c99f8c1296d8aa2d040022faf5951d4cbb976be
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/30a41decc.pdf.
  • 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.
  • 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://traffine.ru/strik?keyword=1+def+pure+guide In PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/30a41decc.pdfIn PDF document text
    • https://zasesitezo.weebly.com/uploads/1/3/3/9/133986829/3317946.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/4376507.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/6a48891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d235dea-48ec-400b-b612-a59521b4e540/dunotalunopojibenup.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/rhapsody_on_a_windy_night_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ec2ef4-4016-4bd1-81a8-be70c061eca8/kekafovomusuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037f1337-680a-4ddc-92f7-cc78568fe77a/zilifibejejofixero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7419df2a-f315-4b5a-bda4-76d11466133c/segun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73eaeca0-5b64-492c-9f7d-6aab0eb7f531/42662230814.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/71353003136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a862601a-f285-4e47-ac77-aeb1cf2d759a/7th_grade_math_milestone_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/odysseyware_answers_algebra_2.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_off00006a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 4744 bytes
SHA-256: b4c9d447468c3739f08d64d351e68f0ced462343994c0d886e6b0e2c9d71cb63
font_01_sfnt_off00007a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A51 10504 bytes
SHA-256: b3daf39f1f764caae2946d299085a53981265adbd246b717d690b2cbf636dc28

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