Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91bbb40ce277a55…

MALICIOUS

PDF

54.3 KB Created: 2020-11-07 07:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fbf341200275ee7cef4cd5aade41cbc1 SHA-1: 20dff1b6bf1fe9441304c5ec1d53440d551dee62 SHA-256: c91bbb40ce277a55f9f08a984c7242e4b68b55e2641b879046d96c90f1ebba8e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafffi.ru/123?keyword=cot+x+graph PDF link annotation
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/fizatutepilux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sajasopul.files.wordpress.com/2020/11/73540802895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfee868-532a-4eb0-afa2-898166ff69b4/dosixifomafadagaluxajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d35697-7b20-4bb8-9678-d065db91779e/miwujejakavedazidolin.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d3524f-5ca5-48ec-ae56-a0b0aa7b9da3/bejejikuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95474702-7862-4392-9bbb-27d6bf8517b3/how_much_does_magcon_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc72c40-06b7-4f26-bd88-344c0dbe1e37/christie_marie_sheldon_unlimited_abundance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b36f6b8-ad7d-46f9-b847-645c0d7b180b/jutixalotefaxodadan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8439e9f5-1017-4c9e-b181-11ceee920836/ledapufozepaki.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://dipadek.files.wordpress.com/2020/11/dufenotugukidozukolek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecb6552-9e4d-47bb-8996-987296dd4912/toliweteropo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57c3d2b-d8fc-4eca-805c-ad3f7123fbd4/sigamogakewixawugux.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000704a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704A 3040 bytes
SHA-256: a20bb4f408d8f784ad73c3448e4c5f25c27999cb50838481ad122ee355a0e39f
font_01_sfnt_off00007b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B35 4844 bytes
SHA-256: 669fd19d0b6eafb221975fd240d18b31e8ee178fe61ae60b3972d415655030a5
font_02_sfnt_off00008bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB0 13084 bytes
SHA-256: 148a49ef3f2a8dba3eaaa19ce5d936e0a098e97d307c73fcb67144bf97becd9e
font_03_sfnt_off0000b635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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