Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a35685fab54ca5…

MALICIOUS

PDF

38.1 KB Created: 2020-11-07 02:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fef00f158ed6922876aea764d36214fb SHA-1: 15b2d76a7eada002a15e9ef985dbd3305044b054 SHA-256: 14a35685fab54ca582dd574150f19bbf0096a29d0afac78c0f3343fef18be1ed
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful sites, aligning with a phishing or content distribution attack pattern.

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://traffset.ru/aws?keyword=psychiatrist+salary+alaska PDF link annotation
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/1242677.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/gawegurovagutakav.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/bb22a9b14.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/754862.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/497fcc1276b.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/7410925.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/rubal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9904a74047f.pdfIn PDF document text
    • https://mizuzakulidux.weebly.com/uploads/1/3/4/4/134471721/lisabodibegiki-dufibot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444357/normal_5fa074dc0935d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5f9a925c8ce09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://movezuzeva.files.wordpress.com/2020/11/atoms_and_molecules_class_9_notes_download.pdfIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.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_off0000566a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x566A 5056 bytes
SHA-256: 2fe768ab74e5dc713ac5cfd5624ecd563e36d420e2320566834f3112762e1a59
font_01_sfnt_off0000679f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679F 10660 bytes
SHA-256: 58a91ef714327cf9687c5c27e827c3d20b3837b0381e069c3e7f75dbf8b3106a

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