Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc4c52916cd1b8b…

MALICIOUS

PDF

83.4 KB Created: 2021-03-15 05:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ba5db3206df24e68a04fc01d6ce3f89d SHA-1: 7379dcceb83782b0d6e6f5e1dc317a4400a62820 SHA-256: 0bc4c52916cd1b8bcd2b93311c8a6b5e8e24398134a94a5d3306309babec04a0
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 0.9967

Heuristics 5

  • 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://golowaki.ru/123?utm_term=bookworm+adventures+pc+game+free PDF link annotation
    • https://cdn.sqhk.co/gorokipo/jj265Sj/sepodutaregokejaxufemolib.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/MsibSCh/pregnant_mom_and_baby_simulator.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/astro_tv_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/Ujei0jf/fern_flower_drawing.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/lexinogurejedil.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/mixikotu.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/DjeVjjy/52777429681.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/cardinal_numbers_1_100.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/case_studies_in_abnormal_psychology_10th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/z8gjjdh/pasalakunuterezakatise.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/jambox_jawbone_speaker_review.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/alphatrak_2_test_strips_where_to_buy.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/meaning_and_scope_of_anthropology.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupesujutiwu.myartsonline.com/kafukigizajagexusevug.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_107d173c0247449c8112d0e44cee87b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4226c2a2-d9fd-41ef-905a-be554f22c47a/yellow_soles_of_feet_in_child.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_b0a359ccf445470caa5a910e88930fa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6960ea8-5146-44f0-9e66-dcba89e532b2/42753287394.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/davis_vantage_vue_6250_review.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_30f4e8d47b9d48a2ba2fd5ebc59401c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e548cf2-e4a1-4540-ad18-9879851dce17/ryobi_10_table_saw_system.pdfIn PDF document text
    • http://sinusudixuxuwad.atwebpages.com/pulmonary_edema_nejm.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_536acf0158ea4e8389129ffec04bcf60.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/ranadijukigasejemosop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0f5381-980b-41a4-9d1d-54dbffb36cf5/voxetebirepifibogibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090a211c-5bdd-461a-9c74-bfb4bb998083/what_the_coldest_it_gets_in_naples_florida_in_december.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_319440236b3441ed92ce77c9dc765930.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 5708 bytes
SHA-256: bcb8b48511afaabc67700df3193198d80eb2a1f9a0a16bc4104c414624b2c7a4
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 11100 bytes
SHA-256: ea9c1c351253ef4619af04dc0f02974937305708cad24d2efe330d2284590308