Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e8a28859aaac85…

MALICIOUS

PDF

160.9 KB Created: 2021-04-06 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe3453354cf7027172e2ecc167b848fb SHA-1: c36bb2d1d31d65cd0a56057b6b6b286e861cce92 SHA-256: 09e8a28859aaac856bd6b93288e17f3ae29a5410e83f45b962fee345a9df7c1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9780

Heuristics 5

  • 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 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://gimoguvi.ru/award?keyword=smart+and+digital+city+a+systematic+literature+review+pdf PDF link annotation
    • https://vaxulisexo.weebly.com/uploads/1/3/4/6/134600260/8ccff7.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/vifetevo_fodeno_wedimizemuz.pdfIn PDF document text
    • https://wemubutuve.weebly.com/uploads/1/3/6/0/136090051/5611193.pdfIn PDF document text
    • http://mavitrade.com/rivomofkpugf.pdfIn PDF document text
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/sesebinulupute-xeselowo.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/gamawuwulivaxew-desarinuvopad.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/fozavewegifo-wukexalijipipi-gakagepupigi-kakex.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/bunanizarazajuxiron.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/lomutiweji-detozufuvus.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/seluveloponugote.pdfIn PDF document text
    • http://lavka-karamel.ru/78446633817i08e6.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/zaverozinulanuziluv.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/zibilaloliminujiz.pdfIn PDF document text
    • https://javagiluxonuv.weebly.com/uploads/1/3/1/4/131406569/tijulexa-radejur-dikigorinozi-wujujonozozujob.pdfIn PDF document text
    • http://joy-todays.online/vonodalitunozebvxqa.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/lolunolovago.pdfIn PDF document text
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/kejunamoraporug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_c9bde829a36b447b9b6db46a04bb3f71.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_94853d89120441c191b03a0304bcfdf8.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_39cc5c495c404ca0a9c04bda5c1c0fb4.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_51ff0ffaf31841218012cc1aee54f7ba.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_f8663c1221d14283b46a36947c49f8ad.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_e4d1ab7af0f14c6785112d0050a532d8.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_e2e29575147242e6b3a29d5bcdaff471.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_0ccf914c309b476cbb6c0f44b6741ed1.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_2502f50664f741d0bc1e47cf0762640d.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
    • 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_off00021538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21538 5604 bytes
SHA-256: 41e63f3d475b60d9540833492850ca72ebee66c8d096d3d8e6a55c40c2d9daba
font_01_sfnt_off00022838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22838 12596 bytes
SHA-256: d3f8cb73a9d27f2d6a1a5513207ca728f3d3bc8854612b3e86708dc62378e76a
font_02_sfnt_off00025139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25139 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off00026668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26668 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3