Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9e82c2f5f0e2b3…

MALICIOUS

PDF

71.0 KB Created: 2021-03-22 20:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c4243ad059fa3bcee9d683c1a6b400f SHA-1: 694350545e0f806e1c293e8c8c36543a7925cc68 SHA-256: 8d9e82c2f5f0e2b3ffba7e6f5cf29e0bd0586ee6e63b5be3d76b275ecebb875b
186 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 pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://gimoguvi.ru/123?utm_term=animal+and+plant+cell+word+search+answers', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=animal+and+plant+cell+word+search+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fd1df80446ff.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/9jaheAc/ferox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fedad70c2a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_601838f655c67.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/gjIghEu/clash_of_clans_account_free_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6046b801dc329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_60264590bbfc5.pdfIn PDF document text
    • https://cdn.sqhk.co/tamireto/u2QWzih/wopelagetawuleginebodogeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_1a75e9cb37854b97b632b1050b01bab3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0dcee3-0444-49f7-9b54-2650ae456146/xbox_one_controller_skins_walmart.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_bbf7d069f3e4496b8c5b073d9dd70f97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0c65b6-faa4-4005-9b65-a4ed02dc8173/microlife_blood_pressure_monitor_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/68829199184.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_50a4da5cd7384d25bed6a1339c8bfac9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/81641302589.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_1c10cab8940741919feb641c0c0c3978.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5483c40-1d10-42e7-a115-450a1f17b8ca/82870053122.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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 5396 bytes
SHA-256: 7b2f9148af8406df1fbf3bc3633a9e6b23d5f50060e84be365cb420dcd1cad2b
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 9800 bytes
SHA-256: 540fbd8267afc56ed8f55d0cae92e0a867f4307520670c8119fd3c07444dd641

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