Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47f86169b341692…

MALICIOUS

PDF

81.2 KB Created: 2021-03-29 17:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5537e8cc1227eef7b7b3d90811ff1af0 SHA-1: 592347ce6790acae535a4e79a212823db14166e5 SHA-256: f47f86169b341692ca06a2a10aa3c799680ad1c321b90b1f50df4c5f8df4eed5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of SEO-related keywords in the URL parameters further supports the idea of a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=cancer+cuello+de+utero+pdf PDF link annotation
    • https://cdn.sqhk.co/bomemenun/geidjhu/tezagutadirenavusixadavaz.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/7T0D70c/dajudetosararokamaza.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/YEhgjFo/95685517455.pdfIn PDF document text
    • http://mebel-albero.ru/angular_form_email_validation_not_workingxy2qy.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/autocad_frame_visibility.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/sunomojowefabep.pdfIn PDF document text
    • http://rofogukiluvupu.mygamesonline.org/navutawitazikejetopur.pdfIn PDF document text
    • http://onesmall.space/cursos_de_ingles_gratis_online_para_adultosiz5p2.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/Igf1jaN/zigzagoon_galar_evolution_shiny.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/elementary_biology_class_12.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/ZibB6I3/red_bream_fish_pictures.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/arteriografia_femoral.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/burus.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/japuruli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kususen.myartsonline.com/auditing_and_assurance_services_international_edition.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/medical_billing_business_plan.pdfIn PDF document text
    • http://nifusotajezunur.atwebpages.com/psychological_theories_of_depression.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_8c45289211c6411f943bc9b5f42f44ff.pdf?index=trueIn PDF document text
    • http://tofilijewok.atwebpages.com/lovevo.pdfIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_00dbb2e691c348a1863cef55c513d8a8.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_d8e9f65b9c86452b8b7cf51bb19e2117.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
    • https://medlineplus.gov/spanish/cervicalcancer.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 4828 bytes
SHA-256: cb83660d2d4f41f76f5754b9b352b6a9c3c9e73bed1f8683bca1cc870c755cd4
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 11480 bytes
SHA-256: f311f3328050792331312caaeb85e1eda8dd6685babc6bbc28beda18a4d9d13b
font_02_sfnt_off000127f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2