Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bbd6134d848657…

MALICIOUS

PDF

98.2 KB Created: 2021-03-16 04:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f315cd65d99eec02128c223c5e4d0ad4 SHA-1: 7dd183bfa1fe8f7525e0cdafdb71dfb894bb83fb SHA-256: b5bbd6134d848657f65cf73de3cac3f99b647b26edf7b1552cb8cc74e9abb796
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to disposable hosting services like Weebly, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://nipisod.ru/award?keyword=stepper+motor+actuator+pdf PDF link annotation
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/344095.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/descargar_gratis_libro_recetas_el_poder_del_metabolismo.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/4469198.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/zawanetebamujolo.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/xivuja_fudemopigugamoj.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/5888039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_600ebe9af4088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_602b782822c5d.pdfIn PDF document text
    • https://merelakududeva.weebly.com/uploads/1/3/2/3/132303156/tetebi.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/7553860.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/7199870.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/253f29dd-3ef9-4c3d-92a0-4fe1b079ba9a/70878791865.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/7103147446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61093e1-8a40-4094-91b3-431011342e30/is_jack_reacher_never_go_back_on_netflix_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/43141664786.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/symantec_dlp_15._5_guides.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/japofogasumazaw.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/ap_edcet_hall_ticket_2019_manabadi.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/i_am_not_perfect_but_i_am_limited_edition_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/massage_therapy_consent_form_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780beb3a-b97f-404e-b907-96c989b9d5cf/how_long_do_harry_potter_wands_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d845a82-d45c-4ec0-b8e8-4f70bdbc7f45/project_management_tools_free_download_excel.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14340 5192 bytes
SHA-256: 55423a06ccb7a00cf76e6df6e6015844a2818016f09187b8e0d2232b6176957e
font_01_sfnt_off000154d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D1 11520 bytes
SHA-256: ae279d8e263fef28e3204f03455ce1cea86ce561e046e96970121a5cbb6fb98a