Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d9c508834daa1b…

MALICIOUS

PDF

38.9 KB Created: 2020-11-04 07:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6da78fe160eacc5a7090776f08a636d0 SHA-1: d29d9925697e601405f698481437f0645702278b SHA-256: 23d9c508834daa1b3e4d778336c027fb3cda01d189457da5cc3f8ee09f2c227a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=naming+ionic+compounds+answers+pogil In PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/pumigogulegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5f9df5bcc32fc.pdfIn PDF document text
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/8c1c8dc.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/dumezanefilideliba.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/regomeripo.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/veloledi.pdfIn PDF document text
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/83b39766d55.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/henghuili-files2/accords_piano_jazz.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/vewikubeparuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7855/8903/files/la_salle_high_school_football_radio.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/evaluation_a_systematic_approach_7th.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/jotojekewedebapitun.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/45029971260.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_off00005b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 5456 bytes
SHA-256: 5674507b28ccd233154e10a56e31a5cd2a5735e250f10d70dbe3afcb1314471d
font_01_sfnt_off00006d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D92 9776 bytes
SHA-256: b880a1cffc7fc4500dcf13ff8888fa0e47948ecb8522dcc189f810cd1c08feda

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