Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abc5be39db2b071…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 02:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 261d592ccf01bf19617016052091c005 SHA-1: ded9df7b19ba7df6ff6099f4e75165abe17ab7fe SHA-256: 1abc5be39db2b0716075b2937e44844ad0c8522ad1684b8085e05174ba034171
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/award?keyword=campbell+sinh+h%25E1%25BB%258Dc+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384472/normal_6018e61628649.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/e9PtNjb/70s_music_oldies_radio_stations_online.pdfIn PDF document text
    • https://buronoveze.weebly.com/uploads/1/3/0/7/130739674/vowejinenenu-safabew.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/jjgYhjZ/sims_4_magecraft_mod.pdfIn PDF document text
    • http://esagafow.fun/la_siesta_del_martes_explainedetwyd.pdfIn PDF document text
    • http://bezprovodov.guru/on_eagles_wings_joncas_sheet_musicdryk0.pdfIn PDF document text
    • https://cdn.sqhk.co/lovaxixifew/iiajguf/speeds_auto_auction_app.pdfIn PDF document text
    • http://opt05.ru/56322965128mipij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474231/normal_5fef3a1ba832c.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/2a4eec88f.pdfIn PDF document text
    • http://alkostore.xyz/soil_mechanics_lecture_notesn0w7p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5fef50a7a6a50.pdfIn PDF document text
    • http://interbankdigital.com/imagenes_de_cerebros_para_colorearplxec.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/chjhcgc/gibuzejoduf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fecec7798250.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ggZjgK1/89728605930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5fe33ecbc0793.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/2842547.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
    • https://s3.amazonaws.com/vigevot/synology_active_directory_server_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63045586-0192-4c06-9ad2-a0121b4a8ab0/rigifekuza.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/gogilage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79d6d27-243e-40ae-b604-f32b99fdaf61/cual_es_la_importancia_de_la_matematica_financiera_en_la_vida_diaria.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/waxepagike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753f0414-6ee0-41d0-81c8-2acb5282d1ec/how_to_pass_comptia_network_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7261a0f9-907c-4429-9515-684287f106ac/61204761507.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5184 bytes
SHA-256: ae171c38337482a82290936deadb9c94152133e221964537f8f9fddfeb6b6cac
font_01_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 21748 bytes
SHA-256: 603c1aee1783a26aa48e64308c1bb9219c07cc9848ba279b33cf9d8e4de22fd0
font_02_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3