Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d756b51680e15ab…

MALICIOUS

PDF

75.2 KB Created: 2021-05-21 19:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a64752d780cdc700dc4522f2e4d6085 SHA-1: 08e29296819c34c64ed38e85a98f61df6b6d263d SHA-256: 2d756b51680e15ab76aeca12b107423c588caf0ab4df065efd6e23ab614f8e12
186 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 ClamAV and 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=five+pointed+star+crochet+pattern PDF link annotation
    • https://bixilojod.weebly.com/uploads/1/3/0/8/130813790/ab843e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_603ef8159cd83.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/59e0d56779398.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/7682792.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/nawawopiwidi-rasur-kidifadin.pdfIn PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/wufogofilamilowinon.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/f0f52f440a2f89.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/c71a1.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/2335032.pdfIn PDF document text
    • https://dawopurasujup.weebly.com/uploads/1/3/0/7/130775219/rupafaxilop-dozezetipoz-xaruvikip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_600e2ea857ef5.pdfIn PDF document text
    • https://jazabibukunete.weebly.com/uploads/1/3/5/9/135962119/4e1905.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/acfc65.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/sojenozap/95792983764.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/cotton_inkjet_fabric_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/vefaperebewisit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d1787c-231e-4c4c-8e6f-2345580569af/83772158118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931b31e4-a639-436b-ae5e-aaec1fe9d7ad/16957337169.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/zuvuxozime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3576fef0-2a5b-4f82-a0de-11df8ee3d83a/55708620089.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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 5144 bytes
SHA-256: 02e8ccef09ff5e6ffed1b049c8fb3774d89f7aebe90a2b20e5070bc502e2857d
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 11144 bytes
SHA-256: d437a5c2fbddd52a88cc5745a04f6af42dc40881d99b8b4bfe1517f24bd6890a

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