Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e4ca68c0ae2e45…

MALICIOUS

PDF

64.0 KB Created: 2021-05-09 16:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7568f814de890e21ef765cc4dfa03ff3 SHA-1: 7c81a53f2fa9eba2ca6662d2d69b409ea0d909c4 SHA-256: 69e4ca68c0ae2e45a37c231830b81484b743c54318435ca7068ee4db6393dbdc
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

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.
  • 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
  • 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=2000+kawasaki+prairie+400+4x4+for+sale
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/4640558.pdf
    • https://xegixubanegak.weebly.com/uploads/1/3/4/8/134887184/e6257f4370315.pdf
    • http://pegejoruvufiron.sportsontheweb.net/phospholipid_bilayer_of_cell_membrane.pdf
    • http://hallop.xyz/the_negro_speaks_of_rivers_summary_in_kannadafiq5s.pdf
    • http://pirunumilusarib.sportsontheweb.net/barron_s_ielts_superpack.pdf
    • http://italiahot.fun/does_dish_network_have_4k8xr0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/mind_maps_powerpoint_template.pdf
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_197445dbc69c4bed8c619f0f64131b7f.pdf?index=true
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_9ee0cb3b01a34a96a6662869c521dc63.pdf?index=true
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_7dfb9641da0c4d819b669d42e345327c.pdf?index=true
    • http://keregimuw.onlinewebshop.net/abstract_reasoning_test_questions.pdf
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_2415ef8a640f441fb434697fab2914ca.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_2e2cdbb3f6014146b5316a3d4f2893a4.pdf?index=true
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_73ab9afdae764e3ebb595e1d4fe0bd7b.pdf?index=true
    • https://s3.amazonaws.com/ditiruz/17460775758.pdf
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_1ab2743910254d0589ba806863956e10.pdf?index=true
    • http://nevafofuvabovid.atwebpages.com/complete_list_of_abstract_nouns.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_9cd98b9282044061b16f81f7d68d75f6.pdf?index=true
    • https://s3.amazonaws.com/rutufokedizon/toselugeg.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_ea59c6b1b5704274bf40af6a237f61dc.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62b.bin
5b99c5a1f8434a08f40cd7136b311045843063f03cf033b7fc385df032406f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5384 bytes

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