Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0618bb9e78699f0…

MALICIOUS

PDF

78.7 KB Created: 2021-05-27 20:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 19399b4c901bbe2211f8e7298fc1c08e SHA-1: 48abbc212c438767a8ff8e1f9178e03df5ce9200 SHA-256: f0618bb9e78699f0215c706db554963843059776bd0d4227cec4ebbed2af8936
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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly identified this PDF as malicious. The embedded URLs and the structure suggest an attempt to redirect users to potentially harmful content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=is+halo+2+playable+on+xbox+360 PDF link annotation
    • https://wexikapej.weebly.com/uploads/1/3/0/8/130874413/lizidazisexaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5ff4f06e5eddd.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/migukifaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_603f8db404508.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/1430663.pdfIn PDF document text
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/mejali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_603b201c3d97d.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/xafexenef_bibazimali.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/8586489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_6058159abee3c.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/mozewilojugudu.pdfIn PDF document text
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/e752d3d1ba.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/xewixurizij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_601328821d92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fd7b70a803b8.pdfIn PDF document text
    • https://tubanepa.weebly.com/uploads/1/3/2/7/132740320/07f6ea2fd4.pdfIn PDF document text
    • https://xolasugoduto.weebly.com/uploads/1/3/4/5/134592704/9461693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_602992319279c.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/8264690.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/2606599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_601e985f2da40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5652 bytes
SHA-256: c5770d70c179996a4c1a9f878bd69af92854bf6f641dc527407cec41320d189b
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 11392 bytes
SHA-256: f8b8116da5b6dce5c9fed5fcf3bda2ec641c0bbfcfd667ba00a912506a40259e

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