Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e52398c8621765…

MALICIOUS

PDF

81.0 KB Created: 2021-03-24 21:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c1587faa6de0bb24c91f26f89048656 SHA-1: 37bb260b92b5c13f6d62718b814a052bcbc24821 SHA-256: 39e52398c86217656aab7f7fdb7ecab358f7428c682e1a81e526f4806bcda2de
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to popular media, aiming to trick users into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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://jacksth.ru/strik?utm_term=the+magicians+season+4+episode+6+subtitles
    • https://sagagedonu.weebly.com/uploads/1/3/4/0/134017332/gawugekavisewuz_zawurolabezan_pufusexe_josotudorojuli.pdf
    • https://cdn-cms.f-static.net/uploads/4392660/normal_601e577d514ee.pdf
    • http://kismykeitio.best/pexosapemuje9al4e.pdf
    • https://cdn-cms.f-static.net/uploads/4392668/normal_601a499ed8f31.pdf
    • https://cdn-cms.f-static.net/uploads/4454430/normal_6033f9a15a1d9.pdf
    • https://cdn-cms.f-static.net/uploads/4492278/normal_5fdaef4610727.pdf
    • http://phillipen.online/fagor_rapid_express_pressure_cooker_reviewsjiino.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/8543614.pdf
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/3471101.pdf
    • http://braco.ru/biwokuxowygk3.pdf
    • https://cdn-cms.f-static.net/uploads/4413126/normal_602e7265ea047.pdf
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/9247548.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_cf2622127a184ddfa49ac72a9346dd8d.pdf?index=true
    • https://be8c9b37-7461-4651-a09d-12e65c455691.filesusr.com/ugd/237bf7_83a175820dcd450baec2c0ab94e5ec72.pdf?index=true
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_7dd0250433d4404db340909089d4b62f.pdf?index=true
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_349a86bcabaf43eebfca6438d23dcc37.pdf?index=true
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_2827ddf046b74c83b01038bdd11da952.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_14470a2567f147d0b24c7c8eb388caa1.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_e9e2566927a743dd8b028329bb53d0a0.pdf?index=true
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_dbe332ccc80d456c97e0bf97f2e20e1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5116d27-58e2-4ffb-88db-4a15c1ec40e7/xebitelawilob.pdf
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_7a0ab3bc68bd45fe98725cccff9341da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd8c80f1-97ed-4ec4-9af4-7a60344bd146/how_do_mountain_lions_adapt_to_their_habitat.pdf
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_2522b24a1cdb46f7ba2acbccab08a98f.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_off0000fb00.bin
7f521d5599f0f652790baffe89cdf9d45c522bc3f30fde1eae30d29a5b0d4e63
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 5724 bytes
font_01_sfnt_off00010e52.bin
c25dd6ab57a323d8871e6d5aa427e47e8e7b3c4f4425381883a8f6304512ede3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 11788 bytes