Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636de89e5d9de62…

MALICIOUS

PDF

68.5 KB Created: 2021-03-07 18:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 44996caa674899c4f7effca5838d3a8e SHA-1: 293e91aecff61cd84ab470336465cd03799b4e82 SHA-256: b636de89e5d9de6267c5662222f93d6bd5dc7f7fc7a32b47040437e439c81b11
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting and redirectors, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URL and the nature of the link farm suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=los+se%25C3%25B1ores+del+narco+pdf+descargar+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468551/normal_5fd76ee2e1152.pdfIn PDF document text
    • http://begetus11ppz.xyz/2951616351735to4.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/angular_2_form_validation_example_plunker62x06.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/3888895.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/lusodul.pdfIn PDF document text
    • http://com-signto5.xyz/foloxikulosojetugezuwufi6x8mt.pdfIn PDF document text
    • http://fenofaxizuva.22web.org/89800045090.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/3836679.pdfIn PDF document text
    • http://helpverifedbadges.com/french_verb_conjugation_faire_passe_composencg46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_60185d6d9f237.pdfIn PDF document text
    • http://xazufajemexeb.22web.org/angular_2_formbuilder_vs_formgroup.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/rexodeja_tabelix_tajokoxuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_600860ad60d34.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/18dbb111-746d-4bf6-9218-f044c52dcf78/sun_joe_spx3000_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6bba29-2216-4c3b-96b9-7e6a5885688d/78509094511.pdfIn PDF document text
    • http://wajiletum.epizy.com/59683482395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550c9148-9418-402f-8e3c-8aee7e1774d9/middle_school_books_in_order_james_patterson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8ad81e-8567-4e06-b4bd-a3075d6245fb/how_to_lower_humidity_on_resmed_airsense_10.pdfIn PDF document text
    • http://jipaxesu.rf.gd/fixing_a_hole_in_sheetrock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0238fbd8-c227-46b3-ba00-4f7df3de8923/2012_vw_jetta_owners_manual.pdfIn PDF document text
    • http://rirazito.epizy.com/matlab_objective_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c218e75e-7b64-4c41-b267-3cdb39f78545/98786274336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc5e68e-25c0-43de-9a62-d32dac40296c/black_ink_not_printing_epson_l120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1f113f-c630-4ee0-9498-8ce2505c4e77/burger_king_around_me_now.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_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 5476 bytes
SHA-256: 02706002b002e5f1df73a1f0ce74ed1b1bb6c92ee3ddb0036a369076caffa96b
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10524 bytes
SHA-256: b3125c84943d909643efbed0409c24246222137ab9842b1d38458a0e56a87e04