Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e0528f772c5e5e…

MALICIOUS

PDF

94.9 KB Created: 2021-03-23 20:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 686a70b6eb0eca0054ca66901535fa10 SHA-1: 568aef2a270e55003119ebb54dfc4d807c565e8b SHA-256: 57e0528f772c5e5e4b09beb35f230784b3bb27964edc86483defb24869da20c3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/wix?keyword=dilation+practice+worksheet+answers PDF link annotation
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/vemekivamobesoj.pdfIn PDF document text
    • http://kabomodom.iblogger.org/resumen_de_el_libro_del_mundo_de_sofia_por_capitulos.pdfIn PDF document text
    • http://dunuzun.iblogger.org/fundamental_of_electronics_engineering.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/319bfd.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/xumanomiverozinij.pdfIn PDF document text
    • http://bridgecommerce.com/36785954466yw3s9.pdfIn PDF document text
    • http://ig-copyrightnotice.com/gupefuxilirarp4ntf.pdfIn PDF document text
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/fikuxe-timim-sunikuwuzaju.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/1288969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_571638862bc5491788b2fad2266e6b1c.pdf?index=trueIn PDF document text
    • http://satavemuso.rf.gd/windows_server_administration_interview_questions_and_answers.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_ff5cbf8aa22142c2b92db79f69d11d1e.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_62c877910b154d818d29583ca668636b.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_2a19ca2ad1e24f22ad19524fa81fa4b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/30728972887.pdfIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_c1734b26673b4689b5f7faf4665e541a.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_d99dc8704f3643c5b8b6b3905475f901.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/awesome_wallpaper_for_android_free.pdfIn PDF document text
    • http://risogida.rf.gd/vaastav_full_movie_openload.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_f5fb79f7ca484d77b993f1b51133bba3.pdf?index=trueIn PDF document text
    • http://fotoburiwolof.rf.gd/who_moved_my_cheese_how_many_pages.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_45c47bba210c4e68b0c35902406ac20a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 5176 bytes
SHA-256: 1c64e1448bdf85ee952c190a2010c6e9ab0f951f188c75e2fabddb3e8dc8eda9
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 11452 bytes
SHA-256: d572cbfe65e4b81d53b66c33b46d83786d28c2d52993a7abbbcf0df9242bb992
font_03_sfnt_off0001585a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585A 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2