Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45797e0a00f2fde…

MALICIOUS

PDF

43.2 KB Created: 2020-11-07 06:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0de26cc60ca45f125e89c151c8053668 SHA-1: ee5519df64e8f615de0cd8942990fff3e70e6e40 SHA-256: f45797e0a00f2fde7a0f6ad261065b92f1c91e6c67229e93e11403a21d3783a6
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a job application. The ML classifier strongly indicates maliciousness, and the structure points towards a malicious PDF designed to redirect users to potentially harmful content.

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=short+cover+letter+for+post+office+job PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456387/normal_5fa518d225a5b.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/repaxagezol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8b7e5c5cb9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5fa0b1e199e6a.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5f91fafc1e4e7.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/30a4fd9b9b9c.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/5425260.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/musenene_xaberel_morupobi_tumegefif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f90129e9d7dd.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/5641705.pdfIn PDF document text
    • https://vajemedodumuni.weebly.com/uploads/1/3/4/3/134351385/jozabe.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/nanigubilunu_worojogokeliter.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/zafaronivaj/do_local_winds_happen_over_long_distances.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/35502809367.pdfIn PDF document text
    • https://sifuwel.files.wordpress.com/2020/11/wajogixosux.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_off000069e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E6 5272 bytes
SHA-256: 2922070ede3db97b680e6f9a35c79dc5a50d745d8b0341f17dff4000340a3f52
font_01_sfnt_off00007bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD8 10320 bytes
SHA-256: 06399e8dfc5051933a3b08198129b6b375189c9a5f8cdac5fdb184e353ee28c3

Open this report in the interactive analyzer, or submit your own file for analysis.