Malicious PDF — malware analysis report

Static analysis result for SHA-256 a565f67850c68a0e…

MALICIOUS

PDF

93.4 KB Created: 2021-03-11 20:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e308d14a7c75122cdd1ce4276440f67 SHA-1: 242acc04760b62aecc93fab72552f6d18931137a SHA-256: a565f67850c68a0e9ba2810dbe4ef9830444cd565d491f02cb06f8ced5fafd2b
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 0.9986

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://jacksth.ru/wix?keyword=tohru+adachi+voice+actor+english PDF link annotation
    • http://bettyloustintruckbbq.com/diary_of_a_wimpy_kid_the_long_haul_jeff_kinney_summarypy2zt.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/91403839545.pdfIn PDF document text
    • http://static-start.top/us_doj_inspector_general_reportucze7.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/aplastic_anemia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458145/normal_6008c3984ac22.pdfIn PDF document text
    • http://macsk.space/kusuremopfcm8t.pdfIn PDF document text
    • http://repair-planshetov.ru/katevakewsvswq.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/30983754273.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/gaxopugexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fdf131d5b35d.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/fapufesofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_6000c3e131675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476954/normal_5fdba629462cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/transformers_the_last_knight_trailer_song.pdfIn PDF document text
    • http://sanojepenot.onlinewebshop.net/fit_for_life_physical_therapy_florida.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_de12b8db429e481d8504fd429c53eece.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_7e049658dd154c72b93547bcd295dd39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/a_gentleman_full_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/auto_transformer_operating_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/93940519935.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_1d0000afeae24c9fa058b627015df1f6.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 11420 bytes
SHA-256: c6ad476da9a77f56f6323d894620eaf774443561e481c27e59bb8b278af24460
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 5208 bytes
SHA-256: 4a77c6e844d3d12ac90260f0bca5b043a15a2f51b342b4fd926948153fd3bf7f
font_02_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 2116 bytes
SHA-256: 3d710a4b121cc3492c3eb33a949758d423697a96dc6070b99fa40abea3aa876d
font_03_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 6068 bytes
SHA-256: 1f79b081fe245cf9181f2e6ad484d5de3f355e0828dbe7aa1c14a68e096e11b6
font_04_sfnt_off00014369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14369 10240 bytes
SHA-256: 34510651032202e2910c7627585c1477deb932e480ea464f5d4943247d2f8593