Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba67b86ca16cdfe…

MALICIOUS

PDF

107.2 KB Created: 2021-05-27 22:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a30c62dec79f0fe3d44f5b9ae912f37c SHA-1: 1c9aa1df426737e61b3e14d4ea485438e7aa1878 SHA-256: 0ba67b86ca16cdfe59dd0763fa3988de93b2994bf35e30eb5f832a1b26986f51
186 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=libro+de+prostodoncia+total+ozawa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470837/normal_601b7bf5185d4.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/ninorakivivotamawa.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/mugabovajazezoma.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/dapararusamowip.pdfIn PDF document text
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/c4f5a99d2593b.pdfIn PDF document text
    • https://tonesokesimo.weebly.com/uploads/1/3/4/7/134757712/a94376bc1f264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_601e14d7c65fb.pdfIn PDF document text
    • https://sutevanu.weebly.com/uploads/1/3/4/7/134770908/00bee6cbd1ac.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/9614604.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/8071005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_601b78542fdfc.pdfIn PDF document text
    • https://duwatazajopi.weebly.com/uploads/1/3/4/2/134235013/muguripivimegowapuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffd1e26df15c.pdfIn PDF document text
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/wuvadojuzukuk-gabatibibizug-wiposidapaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1f7f62-a7d3-443d-83f9-5fa67cf2348d/17414371440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6620e8b7-c6e1-4c9d-b0d3-e63d7d9e2e43/10897574121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62f5dc1-8a3d-4569-89df-3558931c3088/time_saver_standards_for_building_types_latest_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e88f1d-d075-4a90-91ee-c0e4aa2de1d6/jump_force_ps4_new_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb608113-7e5c-4598-a5b6-5f2de35bc97b/wepotesabaxabarazadigozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ef8f46-1434-42bf-8a70-13e7b756eb43/what_does_for_mean_in_golf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3ad047-fc04-4223-98a6-c13c6fa9444c/durodafivobefimagejo.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_off000161dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DD 5372 bytes
SHA-256: 6e92bc938ae6799e1173918bc9aeb106810a6ad62fd5825a0318e7410ba33183
font_01_sfnt_off0001744a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744A 13996 bytes
SHA-256: 4afda3e29c2cd08ddd19d7dfddda5cb15713c1df7ac2cfb0f72cc297a30b2d99