Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a2b7594fd387c6…

MALICIOUS

PDF

40.0 KB Created: 2020-11-06 22:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ed596eeab40df1d684cdcb3e88894e38 SHA-1: 2b5ae1ddd499b85563777269c09deda75ca11859 SHA-256: 48a2b7594fd387c6351bb0fd407ca6bf01be7e0d8e31b4eb4115d160f0d5dcc8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest the primary purpose is to redirect users to other potentially malicious or spam-related content, rather than delivering a direct exploit.

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://traffine.ru/aws?keyword=play+80s+rock+music PDF link annotation
    • https://dovasuseburipir.weebly.com/uploads/1/3/4/3/134394860/373d5705df2bd2.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/33a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f9a3ecb1c0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5f98387cde2f1.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/pifojefas_jibanuporo_lajukasug.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/5007321.pdfIn PDF document text
    • https://fapadeli.weebly.com/uploads/1/3/4/4/134445247/fowogo_pewaj_balak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f8923f830dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f98ec65ee2ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/fozapow.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/28551770665.pdfIn PDF document text
    • https://kirozaber.files.wordpress.com/2020/11/wolejigeluwofexadisux.pdfIn PDF document text
    • https://xarewexupi.files.wordpress.com/2020/11/gitaxoxukujuwogababaxer.pdfIn PDF document text
    • https://zukanowaboj.files.wordpress.com/2020/11/2172809910.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_off00005d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 5448 bytes
SHA-256: 2af9433394fbb500b9469be67993a62084ec1812d8ee63a89885102b4fc9de20
font_01_sfnt_off0000701f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x701F 10348 bytes
SHA-256: fbb612dad72ca5be9aceef4ba9a267ab895ca27748939ae0ca2ab93e5d598123

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