Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb93226d5d423e7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 06:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 803f4a1208027ac88ff48fd0c7470188 SHA-1: 226f0f2ed6c1aa15967d86f0997be6b4932f98fe SHA-256: 9bb93226d5d423e7b09536f76ada3e9157ebc4871a2d3284bcfe77e0dc5a8c6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a high number of external links, many pointing to suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/wix?keyword=pdf+divergente+1
    • http://netzamka.ru/penezejemanufamiler7fz27.pdf
    • http://fastpysystem.online/pemobuzizugapewekh0qq8.pdf
    • http://ewop.space/26773573752q50xt.pdf
    • http://securitycheckingbrowservkcom.xyz/vinuzavejizixakuvspzr.pdf
    • http://power-guard.shop/aoac_methods_19th_editionhsiwx.pdf
    • http://bottlechainworld.com/50260413550cwl0q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_860a884e2a614be9867749b7c758ef94.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_6e664221b12b4eb98ed8d13ad3f6fa47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d0c9455-5009-4ca7-92f9-b701d0869ce6/the_expanse_season_4_characters.pdf
    • https://uploads.strikinglycdn.com/files/737ebf97-7aa9-45a7-9692-5c573e2b7a68/6554245043.pdf
    • https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_a19e23187f63450e85fb0a265e819517.pdf?index=true
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_832312f27faa43218c3434669a3f9daf.pdf?index=true
    • https://59af73f0-4134-4839-87a1-08fb2e8aa53b.filesusr.com/ugd/e3c460_6a24523d3ef34bfa93f65005775d42f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c706cb92-a0c2-45b9-a774-813fac81cf6e/there_are_three_types_of_compound_words.pdf
    • https://uploads.strikinglycdn.com/files/5966bdac-7cfb-4274-8e3b-a681c39e450a/coso_framework_stands_for.pdf
    • https://uploads.strikinglycdn.com/files/e5cec07f-bb07-4728-b863-3356c845413f/togomaxupu.pdf
    • https://uploads.strikinglycdn.com/files/ac80c186-64ef-4fc2-9cb1-d6d764038cc3/how_to_treat_dog_mange_at_home.pdf
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_16b39040d6ae44e3a0b6fa51428defe7.pdf?index=true
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_125ac38624354975a81465d87d8eb2d6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5da9064f-644a-4041-b6ab-c400b68e0519/what_is_rhythm_in_web_design.pdf
    • https://uploads.strikinglycdn.com/files/5b5286ad-f62d-4f50-a636-10fab790b869/board_games_online_with_friends_video.pdf
    • https://uploads.strikinglycdn.com/files/cf8c790b-823d-45a1-a9a7-f939665bdd40/feluxik.pdf
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_b448873cbd044a5db6ae92347b86ee52.pdf?index=true
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_b242d5b1b2a64e88b894e173146afb88.pdf?index=true
    • 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_off0000e43b.bin
5090ef0712e3eee7c07050b36833a7e3ea13fd10bc01c22d707475e0b5ad63da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 4768 bytes
font_01_sfnt_off0000f497.bin
74a6bd22e92d8819508f4f9261e87bd8f183abaef924f226ff6ec2178a549a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 15924 bytes

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