Malicious PDF — malware analysis report

Static analysis result for SHA-256 871fad125cfdccac…

MALICIOUS

PDF

83.9 KB Created: 2021-03-25 01:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 96a35503361d2ac6050afaf9e4b46c7c SHA-1: 811b52f65b21b5c4e077153052828d752a07f7bd SHA-256: 871fad125cfdccac3ec9731f019cfe4b4fdd4d8bcea9d35458b7c47a4253f17f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=blackberry+brandy+nutrition+information PDF link annotation
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/4269742.pdfIn PDF document text
    • https://juzomewe.weebly.com/uploads/1/3/4/3/134350864/nilejixad.pdfIn PDF document text
    • http://rukofuvifoti.22web.org/vozez.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/five_kingdoms_biology.pdfIn PDF document text
    • http://tersq.space/here_is_new_york_-_9_11_memorial_photography_exhibit5nu3r.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/tumofixebapefidanefagipi.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/dujaromexuniwejotigu.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/que_son_signos_de_puntuacion_y_entonacion.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/lawn_boy_returns.pdfIn PDF document text
    • http://bestrongbyg.com/bipikosiwolidalifafa98ibn.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/4429765.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/how_is_macbeth_presented_in_the_play.pdfIn PDF document text
    • https://guxiwejibu.weebly.com/uploads/1/3/4/9/134902351/poridenad.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/sokegabezigexekamasev.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/7779135.pdfIn PDF document text
    • http://woodbonus.net/36838844964j1cb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwebud.epizy.com/fesagagonifisu.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/athoms_mbuma.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/arduino_uno_pin_layout.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/suvekekowavokobopoko.pdfIn PDF document text
    • http://xutakubu.epizy.com/16736951839.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/77921596557.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/acetylene_msds.pdfIn PDF document text
    • http://roronusosewurul.epizy.com/cabeza_de_turco_gunter_wallraff.pdfIn PDF document text
    • http://diratat.rf.gd/hp_elitedesk_800_g1_usdt_power_cable.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/90681457259.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_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 5344 bytes
SHA-256: 3441972a59bce3986c703df7bb29a67e0ca02f9bca5a3701469d7dbcb0ce219e
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 1940 bytes
SHA-256: 9717c572b491d895217c4e958acc8dae43b5536372e998b1a3c12f26fa080abe
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 10544 bytes
SHA-256: 733920fdd385ea810ce3a7b9943afe61d24aef35bcae216e06b2c3b2dc7d6d79