Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80ced2021b78fc5…

MALICIOUS

PDF

86.9 KB Created: 2020-11-07 22:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 87099b87a753d0a4975f045d74f25cb4 SHA-1: d418341de7ef3614c3bdab19b086fff0bbfd61e2 SHA-256: c80ced2021b78fc5fa89dd689472d90a6af368502670b4ca0de98c9bce5c01cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=relational+algebra+operations PDF link annotation
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/7527794.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/lizikilobeje.pdfIn PDF document text
    • https://fulodovujigiw.weebly.com/uploads/1/3/4/0/134016909/f1c63e59bcf16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8d919cca44e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f90dcb1b3a32.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/5269274.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/4619565.pdfIn PDF document text
    • https://sikewebuki.weebly.com/uploads/1/3/4/3/134387003/tarojosekovagu_vudokuvevo_fosol.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/8433d3a4a8f6234.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/wudunepemavukorolore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8719f37aa79.pdfIn PDF document text
    • https://zujususo.weebly.com/uploads/1/3/4/6/134615591/xusupif.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/d490d30e-c705-48a5-8c01-60f66e2bcd2c/govefejijodif.pdfIn PDF document text
    • https://vodideropumu.files.wordpress.com/2020/11/fizawajemameruvigu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 5132 bytes
SHA-256: c996ac337cc8ac9ac3890870ec5c823b104de5f266ba201db39d37416b37b6d8
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 6440 bytes
SHA-256: c4e23ba8a2f3bea87f726d5443503221f01573622575a22f41210b49e09f71ca
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 13404 bytes
SHA-256: 2986b4993dc60ef143ccf8113865b92cd6fa31a6228de73aaac23ea921053c4f
font_03_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 17164 bytes
SHA-256: fb7056240f1ca1b30aeeac6d9dae1dcc1c2979a98f2fe59f4625901181800ce0

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