Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbd7c72ce12eea5…

MALICIOUS

PDF

83.9 KB Created: 2021-04-05 17:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc43d6d99dc7956eaa7cb488a325824 SHA-1: acc8f54d02af835e6da8a41b161ede57873b1e65 SHA-256: 3fbd7c72ce12eea524c5d948bd4431defdb6486e88d6037011daf455dec4b29e
156 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 of which point to suspicious domains, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with the primary suspicious URL being http://tevfikyuce.xyz/73300733511kj89c.pdf. The presence of an embedded URL and the ML classifier's high confidence score further support the malicious nature of this document, likely intended as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=adobe+photoshop+cs2+9.+0+free++mac
    • http://tevfikyuce.xyz/73300733511kj89c.pdf
    • https://cdn-cms.f-static.net/uploads/4371003/normal_60415afb1208c.pdf
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5ffbac5dc7995.pdf
    • https://cdn-cms.f-static.net/uploads/4482189/normal_6039e3a9ef3c9.pdf
    • https://cdn-cms.f-static.net/uploads/4454547/normal_603a0b383beb6.pdf
    • http://strahauto.website/editing_sentences_worksheet_2nd_gradeqrhlz.pdf
    • http://bet-info.ru/harry_potter_and_the_sorcerers_stone_minalima_edition_harry_potter_bookgwsab.pdf
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fe9d96bd9bb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_6109c0085a0f40f6b84b2532b6289b83.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90326df4-69c5-4fe6-a475-d5d62f5b8c67/casio_5081_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/f49c1275-c285-4e7a-b4ef-5c4bb04a4f3f/90661670832.pdf
    • https://uploads.strikinglycdn.com/files/2a5936cb-bf2b-4ad8-b588-f68bdb176c62/world_map_pub_quiz_questions.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_6a0eef0e23cc4a25a37b5fac1276e370.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7337f35-0687-44ac-afd5-68b9c7664c96/best_midi_to_cv_eurorack_module.pdf
    • https://uploads.strikinglycdn.com/files/cac1ce40-68c2-4e5d-8e56-3b9665c9b77f/the_boy_in_the_striped_pajamas_book_cover.pdf
    • https://uploads.strikinglycdn.com/files/f4669bee-2a99-4fde-8d2d-2e7b49f6d939/hp_laserjet_p2015n_print_network_configuration_page.pdf
    • https://uploads.strikinglycdn.com/files/b92e5397-8725-4db5-adf0-ebd542105754/how_many_animorphs_books.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_15241d63515845f5bd1b13b10b629788.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66244645-60d1-452d-8dce-5284cb2bfae1/vowikim.pdf
    • https://uploads.strikinglycdn.com/files/db901097-bfe7-4865-ae85-0b030125e432/how_to_heal_your_life_book_by_louise_hay.pdf
    • https://uploads.strikinglycdn.com/files/e3721251-131e-41fe-993d-b6c597e04fd2/what_do_alchemy_signs_mean.pdf
    • https://uploads.strikinglycdn.com/files/137f4534-312b-41ec-a349-8fab38942c4d/4442805764.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_off00010979.bin
056953d91711ddc04b88ac2752f889c8fd338d92540c5e6fdb5bf7e3d2e2a6e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 5956 bytes
font_01_sfnt_off00011d92.bin
b92b220c539ee05455e1428382c3e9eb73efe2d41739a46d4fd88a4bf6abd489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 10732 bytes

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