Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dc0b79e40f640a…

MALICIOUS

PDF

81.7 KB Created: 2021-06-06 11:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e3b3b450e18030ed8e163ff402aa56e SHA-1: c660a337dd445ff23f4e060c4472f6d069de3e1d SHA-256: b3dc0b79e40f640a9ec7a5e807395ba47de8c72a431957715f120b2929c90b6f
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 0.9925

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://philabc.ru/pbw?utm_term=ejercicios+caligrafia+script+para+imprimir PDF link annotation
    • https://zubenori.weebly.com/uploads/1/3/5/3/135394140/nepowi-rebepinupuw-wisowor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_60028472ecf41.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/gigirapex-pubamikej-dujiriro-kofafofuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_5ff4291a6999f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fdb9e4780042.pdfIn PDF document text
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/dunatibiniwuvuj_jolegof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_605a538fe6497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_604018186fdd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c19ead1-6a07-43d3-abb4-67a779853741/british_dressage_intro_c_test_sheet.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144417774/vibusarozemuxi.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/guluxufamiwuwakup.pdfIn PDF document text
    • http://malamojozag.pbworks.com/f/how_to_connect_ihome_bluetooth_speaker_ibt74.pdfIn PDF document text
    • http://gosavepifij.pbworks.com/f/log_problems_with_solutions.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411489/how_to_move_an_elliptical_up_stairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c00eab1-2d2a-43cd-b860-8c95cf414751/best_phone_video_editing_apps_free.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/tutajibav.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144669123/cantidad_de_divisores_de_12345.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xuwigasefuxeduzuzaxar.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/84821495757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d691273-4872-4b69-89fa-2141dd2a22cb/52650989674.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144608889/tik_tok_app_download_apkpure_in_jio_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a455491-755f-4e81-86db-493ea51bfe58/pharmacotherapy_handbook_10th_edition_free_download.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/how_to_connect_swann_security_camera_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbeae958-7a69-4cd8-87f5-f34ffabbbe8a/what_is_a_tiller_on_an_outboard_motor.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144496239/ducky_one_2_mini_rgb_manual_english.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/nasoxunuboguridiboposur.pdfIn 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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 5368 bytes
SHA-256: 8b97f050ea9a2634ef50f21f37a502265d9d576f035bbe096bf3ca68d1e25144
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 11624 bytes
SHA-256: 2b317efaa5ae0452f1f4dc75a51c5b42212299bdd9dd2e5ceb03a9c9221ea7fa
font_03_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16488 bytes
SHA-256: 4636c7523e8c0c4659ec89c752f488d70eb2ea504770eb3e0be851c502e4ce70