Malicious PDF — malware analysis report

Static analysis result for SHA-256 5685d32d450274b6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 16:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc9ff4192962df644354b4bce66da6f1 SHA-1: ac30b482d81414fd8f706bb07f094d82c41b82bf SHA-256: 5685d32d450274b63985fffc750be1d80c08333ecb19647123b5bc49e4255124
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://kuzutuzo.ru/wix?keyword=battery+operated+hair+dryer+nz', is likely part of this scheme to drive traffic to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://kuzutuzo.ru/wix?keyword=battery+operated+hair+dryer+nz
    • http://warupipujamoru.sportsontheweb.net/penguin_readers_books.pdf
    • https://static.s123-cdn-static.com/uploads/4427528/normal_5fc763a009bf4.pdf
    • http://rolapisi.scienceontheweb.net/22856561082.pdf
    • https://cdn-cms.f-static.net/uploads/4413120/normal_6047176d0d711.pdf
    • http://rilomenininun.getenjoyment.net/11142037868.pdf
    • https://cdn-cms.f-static.net/uploads/4377125/normal_601323360988d.pdf
    • http://nijaxubazaziw.mypressonline.com/9220809259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_032efd6814c04599a52d56904ce577f8.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_c0ca1f11e99949a59a2f4f413c30550d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b156035d-bbca-4d6e-beb4-69ffbe840d28/dlink_dcs-5020l_recording.pdf
    • https://db6d3479-2aeb-4a59-914c-1f55c48648c8.filesusr.com/ugd/9f5433_c5ded56af8f24d18a60de2de569cf5e2.pdf?index=true
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_033787cf93eb40c6bd66005da951303f.pdf?index=true
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_d81a2ef62e13479c9f4f0877343bc454.pdf?index=true
    • http://nuluwajewugutik.onlinewebshop.net/48576712120.pdf
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_113091516576493896591c57031cf15f.pdf?index=true
    • http://likewiwojuxus.atwebpages.com/accelerated_mobile_pages_tutorial.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_7594de1240fa446a9b554d45e8bf497f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bb1f2cc-6558-436f-abae-395387ec105a/how_do_i_use_my_aroma_professional_rice_cooker.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef97.bin
e72c7755d9d084e3de42546f61d73f70a53087660b5920b8cd682288cfb758aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 5036 bytes
font_01_sfnt_off000100c2.bin
4338a5606b6b9ae661b4ab59b2f712ada38498cbb5cac5dbbe45ecdfd93688b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 10288 bytes

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